Yeah! If you take BSc Mathematics as a course then you can take Physics as a Generic Elective. Now apart from this if your college offers you can take the courses stated below:

• Statistics
• Chemistry
• Economics
• Computer Science

Any of this subject have a great scope ahead in academics and also can help you if you are aspiring to go for the research.

To know more about Mathematics as a career visit the link below:

https://www.careers360.com/courses/mathematics-course

I hope this answer helps. All the very best for your future endeavors!