Guy can an international student play college sports (D2 or D3) as a graduate after doing undergraduate of 3 years from a university outside the USA ?
NCAA rules give you 5 years to play 4. The clock starts running went you start attending college after high school graduation.
Yes, many grad students play sports. Some finish their undergrad in 3 years, some red-shirted for one year, some never played as an undergrad.