Yes, VICARIOUS is a Scrabble word!

Letter values in Scrabble US: V 4, I 1, C 3, A 1, R 1, I 1, O 1, U 1, S 1.

Is it a valid word?

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

experienced at secondhand
occurring in an abnormal part of the body instead of the usual site involved in that function
suffered or done by one person as a substitute for another