Yes, SADES is a Scrabble word!

Letter values in Scrabble US: S 1, A 1, D 2, E 1, S 1.

Is it a valid word?

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

French soldier and writer whose descriptions of sexual perversion gave rise to the term `sadism' (1740-1814)

Also: de sade, comte donatien alphonse francois de sade, marquis de sade.