Yes you can - if it's an EOS system, it's an autofocus lens that is still compatible with any Canon digital SLR.
Do note though that any digital Rebel or entry- to mid-level Canon DSLR you get will have what's known as a 'crop factor' - which means that whatever lens you attach to the camera will have the focal range multiplied by 1.6 times. The lens is perfectly usable, but a 70mm lens will give you the equivalent focal range of 112mm (70x1.6). So your 70-200 lens will behave like a 112mm to 480mm lens. This is lots of fun for the telephoto end, but you lose as much wide end...just keep that in mind!