Yes, HANDBALLS is a Scrabble word!

Letter values in Scrabble US: H 4, A 1, N 1, D 2, B 3, A 1, L 1, L 1, S 1.

Is it a valid word?

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

a small rubber ball used in playing the game of handball
a game played in a walled court or against a single wall by two or four players who strike a rubber ball with their hands