MS degree after a PhD in physics
I'd recommend looking at the job market and seeing what jobs sound appealing to you. Next go to Coursera, Youtube, etc. and see if you like the subject by watching a few online classes. If you think you can adequately self learn the subject then that is the best option. Employers might look at the PhD -> MS like you are a professional student that lacks direction (plus it's a boatload of money). You want your resume to say, I have a PhD in physics which means I'm smart and I self taught myself all this stuff you require for this job because I am self motivated. It shows independence; if you need to learn something new on the job, they know you can do it, because you have done it before. Don't waste time getting an MS.

There are two exceptions to this, and it may apply here. (1) If in your new field of study you can't adequately learn the vast majority of the material without the infrastructure provided by University lab facilities containing tons of expensive equipment, then it would be reasonable to pursue the masters. (2) An MBA program that is all about networking, pretty much requires face to face interactions, although an MBA is usually thought to be best pursued after having some industry work experience. 

The answer to your question, however, is yes, you can definitely get into the Masters programs. For most private schools masters programs are cash cows that fund the university. They let in all students they think are good enough to succeed in their program. The bigger question is whether it's a good idea for you to make this career move.