The purpose of this study is to develop a prediction model of beach evolution using a quasi-3D current model that can predict the shoreline changes. In this study, the 3D morphodynamic model with shoreline changes proposed by Kuroiwa et al.(2004) were modified. The modified model was applied to several model tests of the beach evolution around detached breakwaters in order to examine the performance of the 3D morphodynamic model. Furthermore, the application to beach evolution around a groin and pocket beach was carried out and then the applicability of the modified model was discussed.