Good question. Depending on the university you are looking at you might find different business majors. Some of the classic ones are Accounting, Finance, Marketing, Management, Economics, even Entrepreneurship and Innovation. Depending on what kind of business you are looking to one day have or whether you are planning to be a one-man operation or bring others into the business early on, is the major you should focus on. For example, it might be smart to learn finance and accounting to be able to do your own books for a while or learn management to be an effective leader and employer.
Entrepreneurship is not an exact science and you won't become a great entrepreneur by just finishing your degree, but I would recommend you start your entrepreneurial journey as you are in college so you can identify areas you need to learn more about and also get support and key feedback from your professors and classmates who might be entrepreneurs themselves.
Hope this helps answers your question. Good luck!