Do Physics grad schools accept non-physics students with good Physics GRE score?
Graduate admissions is based on lots of different factors.  I don't think any one thing will make you in-eligible for acceptance, at even the best institutions---including not being a physics major.  That being said, unless you have physics (or similar) experience, or are in a related field, it will hurt your application.  I know numerous people with math, computer science, engineering and chemistry backgrounds who have joined (and are doing well in) prestigious physics programs (e.g. stanford, chicago, columbia).

If you have experience in a not-too-distant field (e.g. chemistry), one way to make your application more appealing - would be if you are interested in subjects somewhere between physics and chemistry (for example).

If you can demonstrate that you have excelled in your own field, and have an aptitude for physics (e.g. good GRE scores), you shouldn't have a problem!