I have a problem integrating a reader with ADHD

There is a child in my high school D & D group with A.D.H.D and he has a lot of trouble staying still and distracting other players. He amuses himself a lot by having fun and does not seem very interested in playing, but he insists that he wants to play.

I've been considering asking him to stop playing for awhile so that other players can learn the game and help him more, but I think it could scare him away. He's a good boy and he's not a lot of friends, but he's preventing others from playing the game. I saw that he was getting up and literally starting to fight with one of the other players. What should I do?