easy way - campus job (not sure gov will restrict that as well, you may want to double check)
harder way - there're many other ways out there that you could make money, think outside of box and not just things around your major / school, you can sell things on ebay, you can programming for others for profit, you can install & setup security camera systems for others for profit.
Generally you want to take advantage of things / information that you know but others don't and transit it into profits. In my own experience that really works, I used to flip things on ebay and made ~$100-300 per day which only required 1-2 hours of work each day. I paid all my tuition and my living expenses with that. Yes, I also did other things to generate profits so don't limit your imagination.
It was hard for me to make the first move (afraid of lose initial investment, uncertainty, afraid of change, working on things I don't have domain expertise, etc), but as long as you are willing to get your hands dirty, you will find ways to make nice money.