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Have you already got a girlfriend or a partner? Maybe you could keep mentioning her and talk about her a lot, and he might get the hint.
Or you could just keep moving away from him a foot or two every time he does that, and politely shrug him off when he touches you.
I think the best way might be to wait until he touches your back or your shoulder like that and laugh and say 'Sorry mate, I just ain't like that!' in a joking way, and then keep talking about whatever you were talking about before. It saves face both for you and him - if he does have a crush on you he'll get the hint and not be too humiliated, and if he doesn't then he'll realize that he's a little too close for comfort and he'll back off, and he probably won't mention it again.
Of course, there's always the chance that he simply doesn't realize what he's doing. Like redlemon said there, different cultures have different notions of what constitutes personal space, and what's too close for comfort.
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