Yes, SWEATSHOP is a Scrabble word!

Letter values in Scrabble US: S 1, W 4, E 1, A 1, T 1, S 1, H 4, O 1, P 3.

Is it a valid word?

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

factory where workers do piecework for poor pay and are prevented from forming unions; common in the clothing industry