Yes, HEAVENS is a Scrabble word!

Letter values in Scrabble US: H 4, E 1, A 1, V 4, E 1, N 1, S 1.

Is it a valid word?

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

the apparent surface of the imaginary sphere on which celestial bodies appear to be projected
any place of complete bliss and delight and peace
the abode of God and the angels

Also: celestial sphere, vault of heaven, promised land, shangri-la.

Not playable in Scrabble US: EDEN.