It sounds to me like you really might want to try getting him more arts & crafts things to do. When you took away his electronics, it sounds like that's what he gravitated towards, assuming moon sand is something artistic. *Just looked it up,* and I actually think playing with moon sand isn't a bad thing at all. It strongly encourages creativity. I would suggest trying pottery classes, or see if he likes lego sets or other construction toys. Yes, some of it constitutes play, but there is also a certain level of intellectual stimulation involved with figuring out what to build and how to build it.

If getting him active is an issue, then I agree with sneschalmers that a bowling league might be a good idea. It's a good sport for kids who don't necessarily like other sports (I did like other sports, but bowling was always my favorite).

As far as getting him socially active, all it takes is finding the right extra-curricular activity. "Socially inept" children, as you call them, tend to be more socially inclined towards other kids with similar interests. I think if he found a pottery class he liked with some other kids who liked pottery too, he'd do great. Also, video games are increasingly social these days. You should see if there are any local gaming stores that might have weekly video game tournaments, and that could provide another form of social interaction for him.

Hope this helped!

~Dish