Yes, REMANDS is a Scrabble word!

Letter values in Scrabble US: R 1, E 1, M 3, A 1, N 1, D 2, S 1.

Is it a valid word?

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

the act of sending an accused person back into custody to await trial (or the continuation of the trial)

refer (a matter or legal case) to another committee or authority or court for decision
lock up or confine, in or as in a jail

Also: send back, put behind bars, put away.