yes, you can. If you are a full-time EU or EEA student (or from Iceland, Lichtenstein, Norway, or Switzerland) you can work for up to 20 hours per week. If you are a full-time student from outside of the EU, you will be limited to working up to 120 full days or 240 half days per year before you must apply for a work permit. Upon gaining paid work in Germany you should contact the German employment office to learn about the legal conditions