Well it sounds like you're going to do the right thing. If you told him you didn't appreciate it and asked him to stop and he didn't, then it is blatant harassment and the coach could probably do something about it.

There was a boy on the football team in my school who used to walk down the hallways swinging his arms and "accidentally" touching girls' crotches. I went to the coach about it and he was benched for a game and never did it again.