No, Isaac —

A non-Catholic cannot go to Confession, but there are pathways for forgiveness of sins.

Here's a breakdown:

Who Can Receive the Sacrament of Penance?

• The sacrament of Penance, also called Confession, is for members of the Church who have sinned after Baptism. (1, 2, 3) It offers a way to convert and recover the grace of justification, especially for those who have fallen into grave sin and lost Baptismal grace. (1)
• The sacrament of Penance is necessary for salvation for those who have fallen after Baptism, just as Baptism is necessary for salvation for those who have not yet been reborn. (4, 5)
• Those who approach the sacrament of Penance obtain pardon from God's mercy for offenses committed against Him, and are reconciled with the Church, which is wounded by their sins. (3, 6)

What is the Sacrament of Penance?

• Penance is a sacrament instituted by Christ to forgive sins committed after Baptism. (7, 8)
• In this sacrament, forgiveness is granted through the priest's absolution to those who confess their sins with true sorrow and promise to make amends. (8)
• The sacrament involves the penitent's actions of confessing sins, feeling sorrow, and intending to make amends, along with the priest's absolution. (8, 9)
• It is a means appointed by Christ for the remission of sins. (8)

Forgiveness of Sins for Non-Catholics.

• The Church continuously offers opportunities for penitence after Baptism, recognizing human frailty. (2)
• The Catechism states that Baptism is necessary for salvation for those who have not yet been reborn. (4, 5)
• For those not baptized, the Church teaches that perfect contrition, along with the desire for Baptism, can bring about the forgiveness of sins. (11)
• The Catechism recommends frequent reception of the Sacrament of Penance, especially during times of fasting and penance, even if serious sins have not been committed. (2)

Perfect Contrition.

• Perfect contrition is sorrow for sin that springs from a love of God above all else. (11)
• Imperfect contrition is born of considering the ugliness of sin or fear of eternal punishment. (11)
• Perfect contrition obtains forgiveness of mortal sins if it includes the firm resolution to have recourse to sacramental confession as soon as possible. (11)

In summary, while the Sacrament of Penance is specifically for Catholics (1, 2, 3), non-Catholics can have their sins forgiven through Baptism or an act of perfect contrition with the desire for Baptism. (11)

References:

1.  CCC 1446

The sacrament of forgiveness. 1446 Christ instituted the sacrament of Penance for all sinful members of his Church: above all for those who, since Baptism, have fallen into grave sin, and have thus lost their Baptismal grace and wounded ecclesial communion. It is to them that the sacrament of Penance offers a new possibility to convert and to recover the grace of justification. The Fathers of the Church present this sacrament as the second plank [of salvation] after the shipwreck which is the loss of grace. (Tertullian, De Paenit. 4,2:PL 1,1343; cf. Council of Trent (1547): DS 1542)

2. Instruction for Applying the Liturgical Prescriptions of the Code of Canons of the Eastern Churches 88 / Congregation for the Eastern Churches
3. Code of Canon Law 959

4.CCC 980

I. One Baptism For The Forgiveness Of Sins. 980 It is through the sacrament of Penance that the baptized can be reconciled with God and with the Church: Penance has rightly been called by the holy Fathers "a laborious kind of Baptism." This sacrament of Penance is necessary for salvation for those who have fallen after Baptism, just as Baptism is necessary for salvation for those who have not yet been reborn. (Council of Trent (1551): DS 1672; cf. St. Gregory Of Nazianzus, Oratio 39,17:PG 36,356.)

5. CCC 980
6. CCC 1422

Article 4 The Sacrament of Penance and Reconciliation. . . 1422 "Those who approach the sacrament of Penance obtain pardon from God's mercy for the offense committed against him, and are, at the same time, reconciled with the Church which they have wounded by their sins and which by charity, by example, and by prayer labors for their conversion." (Lumen Gentium 11 § 2)

7. A Catechism of Christian Doctrine (The Baltimore Catechism No. 3) 721
/ Third Plenary Council of Baltimore
8. Catholic Encyclopedia The Sacrament of Penance / The Encyclopedia Press

9. CCC 1491

In Brief: The Sacrament of Penance and Reconciliation. . . 1491 The sacrament of Penance is a whole consisting in three actions of the penitent and the priest's absolution. The penitent's acts are repentance, confession or disclosure of sins to the priest, and the intention to make reparation and do works of reparation.

10. CCC 1491

11. February 28, 1999: Visit to St Mary Star of the Sea Parish in Castel Fusano on the Ostia seashore - Homily / Pope St. John Paul II

Magisterium A.I.

Dear Isaac,

Let me follow up on Magisterium A.I.'s answer.

Your first question implies you have a belief in the Sacrament of Confession.

Hi, guys —

There are certain conditions under which a non-Catholic can receive the Sacrament of Reconciliation. For example, those baptized who are about to be received into the Church, before they are received into the Church, go through the sacrament.