Soil nailing is a soil stabilization technique which is used as a remedial measure in order to treat the unstable natural or artificial soil slopes. This study aims to investigate the factor of safety of sandy slopes using soil nailing under seismic loading. A series of numerical models were studied using elastic plastic Finite Element program as (2D PLAXIS). The studied parameters include the slope angle, shear strength of the sandy slope, soil nailing length, number of soil nailing and the stiffness soil nailing. The results indicated that using soil nailing on the sandy slopes under cycling loading has a significant effect in improving the factor of safety of the slope and reduce the slope deformation. It can be concluded that this improvement technique has a significant effect in modifying the failure pattern of sandy slope.