I like this guy, but he's really shy, how do I get him to make the first move?

I don't think its possible to get him to make the first move. If he's that shy then he will sit in the side lines and just look at you from a distance.

The worst thing you can do is put him in a bind. If you make him feel pressured then he will try to distance himself and that's not what you want. Don't ask him questions that would make him uncomfortable (worst question possible being "do you like me").

What you should do is make him feel like your really open and you will treat him nicely. If you catch him looking at you or something smile back at him and give him the impression that "i want to get to know you".

Try to get him talking about a subject he is really passionate about or something you know he knows a lot about. People feel more comfortable talking about something that they feel they have expertise in, so pay close attention to what he does say, wear or do that can give you a clue as to something he likes. If he wears clothing for a certain sports team or you notice that he doodles on his papers or something, ask him about that or compliment him. It will make him feel that you value his knowledge or skills related to what you complimented him about and that can give you a starting place for a conversation. If he doesn't say all that much, try to show how you are also interested in the topic. The most important part is to make him feel that his input is valuable so he will want to expand on the topic.

You should get to know him better. Then start flirting and then see where it goes after that. Maybe he hasn't made a move because he doesn't know you as a person yet. Casually take the conversation away from school talk and talk about a movie that you would like to see or a restaurant you are craving maybe he will take the hint and ask you out!