I don’t know if it ended up being his final resting place, but I do know that he planned to do as much.

ALL these edifices the emperor consecrated with the desire of perpetuating the memory of the apostles of our Saviour. He had, however, another object in erecting this building: an object at first unknown, but which afterwards became evident to all. He had in fact made choice of this spot in the prospect of his own death, anticipating with extraordinary fervor of faith that his body would share their title with the apostles themselves, and that he should thus even after death become the subject, with them, of the devotions which should be performed to their honor in this place. He accordingly caused twelve coffins to be set up in this church, like sacred pillars in honor and memory of the apostolic number, in the center of which his own was placed, having six of theirs on either side of it.

https://sourcebooks.web.fordham.edu/basis/vita-constantine.asp