The Italy U19 International is moving to PSG as a free transfer, with its contract to end at the end of June.
Marin, 18, will sign a five -year contract with PSG on 1 July, says L'Equipe.
The young person will move to PSG as a senior third-choice keeper and work with colleague Italian Gigio Donnarumma.
Marin moved to Roma in 2022 and was born and raised Brazilian, although Italian has citizenship.