The main objective of the present research is to increase the resistance of concrete reinforced concrete slabs with sand blasting layer. The use of a sandwich layer, due to the cost of materials and the simplicity of the implementation, is a well-known method. In this study, the experimental results of the literature have been used to verify the finite element modeling. For accurate examination of the effect of sand protection layer thickness on the RC concrete slab behavior, the slab with different thicknesses of the sand layer has been studied using the dynamic analysis involved in Autodyn's finite element software. The parameters studied include the reduction of radial cracks, the shelling of the upper and lower sides of the slab, and also the reduction of the maximum variation of the center of the slab. The results of this research lead to the determination of the optimum thickness of the sand layer to provide the desired performance of the explosion-proof slab