  The existence of sterile neutrino is hinted by simultaneous explanation of
diverse neutrino anomalies. We suggest that the quasi Goldstone fermions (QGF)
arising in supersymmetric theory as a result of spontaneous breaking of global
symmetry like the Peccei-Quinn symmetry or the lepton number symmetry can play
a role of the sterile neutrino. The smallness of mass of QGF ($m_S \sim
10^{-3}-10$ eV) can be related to the specific choice of superpotential or
K\"ahler potential (e.g., no-scale kinetic terms for certain superfields).
Mixing of QGF with neutrinos implies the $R$-parity violation. It can proceed
via the coupling of QGF with the Higgs supermultiplets or directly with the
lepton doublet. A model which accounts for the solar and atmospheric anomalies
and the dark matter is presented.
