A.R.
Hi Andrea:
I just went through this a few months ago when my son was 7 months old. Here is how we solved it. My pediatrician had told me, when my son started rolling that if he rolled to his stomach and fell asleep that was fine. After rolling him back for a few days (just like you are), I knew that we were just teaching him that if he rolled to his stomach and cried we would come in to rescue him. Without any other alternatives, I had to let him CIO and fall asleep. (Which was hard because I'm not an advocate of CIO.) Nonetheless, it worked after 2 tries and he has now become a great sleeper. He also hated tummy time would moan like we were torturing him (LOL), but I "worked" with him during the day on rolling...from his stomach to back and, literally, within days he could roll around the crib again both ways like an expert. Now, he does sleep much of the time on his stomach and he has become SUCH a good sleeper. :-)
Good luck to you and your little one!
A.