Just literally majoring in physics and/or math. Once you get your undergrad degree, then you can focus on a particular kind of physics. Math will still remain just math.
Like already stated you can literally just focus on a Math or specific Physics degrees after undergrad, if you are looking for stuff that has both you could look into aerospace engineering or something like that but should find something your interested in that has them both if thats what you want.
usually engineering is something that has anhigh chance of giving you a job and engineering relies heavily on physics and math. Studying like statistics is also valuable