What can I do to get my snowboarding career financed?

If you want to go pro your only option is to quit school, ride, and get sponsors. Since you haven't been riding for long I would say that you probably aren't good enough to go pro. With the level of riding these days is very hard to get sponsored even if you have been riding for years. My advice is to stick with college, graduate, get a lucrative job, and ride in your free time.