Yes. I used Sallie Mae and private loans to fund business school. However, if you can do it, try to self-fund or to get scholarships and grants. It's a lot better to be done with graduate school debt-free, as then you're not locking yourself into the hunt for the highest salary you can find. Do as I say, not as I did. :-)
The other consideration is whether or not your graduate schooling is going to provide an appropriate ROI, assuming that you're using it to improve your income. The fact that you're asking about financial aid implies that you're somewhat young and early in your career. So, my advice is...
DON'T WASTE YOUR MONEY ON A GRADUATE DEGREE IN SOMETHING WHICH DOESN'T SIGNIFICANTLY IMPROVE YOUR INCOME!
Getting a MA in 13th century Antarctic literature may make you feel fulfilled, but it won't put food on your table when you're saddled with a $100,000 anchor called student loan debt.
Here is a link you may find helpful http://www.classesusa.com/schools/30426-page1.cusa