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Shock absorbers are often situated on top of rock-sheds to mitigate the effects of geological disasters such as rockfalls. In this study, three full-scale impact load tests, with impact energies of approximately 250, 500, and 1000？kJ, investigated a new type of shock absorber comprising expanded polystyrene, steel material, and sand cushion. Comparing the results of the full-scale tests with the results through sand cushion—a common material used for shock absorbers—the maximum impact load in this study was reduced by around 50% than the empirical formula suggested by a rockfall mitigation code. Besides, the study utilized LS-DYNA finite element software to find out the limitation of energy absorption, accuracy of simulation, input parameters for inferential impact formulas of the shock absorber, and to generate a reasonable simulation for use in further research and design of rock-sheds