Under the new regulatory requirements for nuclear power plants, the increase in standard ground motion has underlined the need to evaluate the effects of liquefaction on Pleistocene sands, conventionally regarded as non-liquefiable soils. One characteristic of Pleistocene sand is age-related cementation. However, only a few comprehensive studies have been conducted on the degree of cementation required to assess the effects of liquefaction. In this study, various element tests, such as unconfined compression tests, drained monotonic and undrained cyclic hollow torsional shear tests, and cyclic triaxial tests, were conducted using sand with cement to investigate the effect of cementation on the seismic behavior of sandy soils. When sand is properly cemented, shear failure occurs before the excess pore water pressure ratio reaches one under undrained cyclic loading, and liquefaction does not occur such that the effective stress reaches zero. The effect of cementation is observed not only in the cyclic resistance ratio but also in the maximum excess pore water pressure ratio during undrained cyclic loading, unconfined compression strength, dynamic strength to static strength ratio, and shear modulus dependence on confining pressure. These indices can be used as criteria to determine whether the effects of liquefaction should be considered.