Is thind is saini caste

Yes. Yes original Thind or Thinday is a Saini sub clan. They are the descendants of Saini (Yaduvanshi) Rajput Raja Thind Pal who ruled Mathura around 1000 AD . Among Hill Rajputs, the clan is found as Thandiyal.

Jats and Kambohs also have this clan which may also have originated from Sainis . This can be said confidently because Thind Pal was a confirmed Saini king.