The swash zone experiences constant changes in wave conditions due to tidal changes and the wave run-up and backwash, leading to fluctuations in soil water content. Therefore, the purpose of this study is to elucidate the interactions between soil water content and elevation changes that occur along with these wave conditions. Field surveys were conducted in the swash zone to measure soil water content and ground elevation change using a laser distance meter at the same location, and the relationship between the two was investigated. The results showed that soil water content varied periodically in response to tidal level and wave run-up. Furthermore, each period of soil water content change was divided into time interval, and the relationship with ground elevation change was examined for each interval. It was found that during the rapid increase in soil water content during flood tide, sediment deposition increased with shorter durations of the period, and during the soil water content stabilization at high level around high tide, sediment deposition increased with longer durations of the period.