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We consider a weak scale supersymmetric seesaw model where the Higgsino isthe next-to-lightest supersymmetric particle and the right-handed sneutrino isthe dark matter candidate. It is shown that, in this model, inverse decays,which had been previously neglected, may suppress the sneutrino relic densityby several orders of magnitude. After including such processes and numericallysolving the appropriate Boltzmann equation, we study the dependence of therelic density on the mu parameter, the sneutrino mass, and the neutrino Yukawacoupling. We find that, even though much smaller than in earlier calculations,the sneutrino relic density is still larger than the observed dark matterdensity.

Inverse decays and the relic density of the sterile sneutrino