The elastoplastic deformation behavior of soils can be described in a certain accuracy by the subloading surface model for soils in which the isotropic hardening is induced only by the plastic volume change. However, it should be noticed that sands, which possess far smaller void ratio than clays, exhibit quite different plastic deformation behavior depending on a void ratio. Therefore, the deformation behaviors of sands undergoing a large variation of void ratio cannot be described accurately by the past subloading surface model of soils. In this article, the modified subloading surface model for sands is proposed by incorporating the deviatoric plastic strain in addition to the plastic volumetric strain in the evolution rule of the isotropic hardening. Then, the validity of the proposed model is verified by the simulation of some test data.