Yes, HANDWHEEL is a Scrabble word!

Letter values in Scrabble US: H 4, A 1, N 1, D 2, W 4, H 4, E 1, E 1, L 1.

Is it a valid word?

HANDWHEEL is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a wheel worked by hand
control consisting of a wheel whose rim serves as the handle by which a part is operated