  We show that the $B-L$ Supersymmetric Standard Model with Inverse Seesaw
(BLSSMIS) provides new Dark Matter (DM) candidates (lightest right-handed
sneutrino and lightest $B-L$ neutralino) with mass of order few hundreds GeV,
while most of other SUSY spectrum can be quite heavy, consistently with the
current Large Hadron Collider (LHC) constraints. We emphasize that the thermal
relic abundance and direct detection experiments via relic neutralino
scattering with nuclei impose stringent constraints on the $B-L$ neutralinos.
These constraints can be satisfied by few points in the parameter space where
the $B-L$ lightest neutralino is higgsino-like, which cannot explain the
observed Galactic Center (GC) gamma-ray excess measured by Fermi-LAT. The
lightest right-handed sneutrino DM is analysed. We show that for a wide region
of parameter space the lightest right-handed sneutrino, with mass between 80
GeV and 1.2 TeV, can satisfy the limits of the relic abundance and the
scattering cross with nuclei. We also show that the lightest right-handed
sneutrino with mass ${\cal O}(100)$ GeV can account for the observed GC
gamma-ray results.
