In cast-in-place pile construction, a stabilizer is placed in the borehole to provide a protective layer and prevent collapse until it is replaced by concrete. However, if the stabilizer contains a concentration of sand particles greater than 1%, it can significantly reduce the pile’s ultimate strength. Therefore, the sand particles are allowed to settle several times during the borehole construction before the stabilizer is placed back into the borehole. In this study, we conducted a comparative study of experimental and analytical sand settling behavior to understand the settling behavior of sand particles. The moving particle semi-implicit (MPS) computer-aided engineering (CAE) method was used to simulate 75 µm and 150 µm sand particles. In addition, a laboratory experiment of the same scope as the simulation was conducted for the 75–150 µm sand particle. The concentration of sand at three different locations was measured and compared between the two studies. While the results did not match perfectly, the overall pattern of sedimentation was consistent.