OP, on the actual topic of your questions, as so many have failed to grasp:
You would probably have to apply as a graduate, not an undergraduate, I'm not sure how many universities offer graduate courses so you may have to apply to undergrad. It depends entirely what you got in your degree as well, but I think you should look at the universities you want to go to for their requirements as I'm guessing international students will have a different application process (such as, not doing certain exams etc)