  In this paper we study double scalar neutrino inflation in the minimal
supersymmetric seesaw model in light of WMAP. Inflation in this model is
firstly driven by the heavier sneutrino field $\tilde{N}_2$ and then the
lighter field $\tilde{N}_1$. we will show that with the mass ratio $6\lesssim
M_2/M_1 \lesssim 10$ the model predicts a suppressed primordial scalar spectrum
around the largest scales and the predicted CMB TT quadrupole is much better
suppressed than the single sneutrino model. So this model is more favored than
the single sneutrino inflation model. We then consider the implications of the
model on the reheating temperature, leptogenesis and lepton flavor violation.
Our results show that the seesaw parameters are constrained strongly by the
reheating temperature, together with the requirement by a successful inflation.
The mixing between the first generation and the other two generations in the
right-handed neutrino sector is tiny. The rates of lepton flavor violating
processes in our scenario depend on only 4 unknown seesaw parameters through a
'reduced' seesaw formula, besides $U_{e3}$ and the supersymmetric parameters.
We find that the branching ratio of $\mu \to e \gamma$ is generally near the
present experimental limit, while ${\rm Br}(\tau \to \mu \gamma)$ is around
$\mathcal{O}(10^{-10} - 10^{-9})$.
