This study has focused on soil moisture in agricultural lands which affected by environmental effects of climate change due to global warming. Climatic changes that may occur in the Mediterranean basin based on the A1B climate projection of IPCC which is primarily indicated among possible climate change scenarios in AR4, have been associated with soil moisture in the agricultural areas of Aydın province. The change of climate regime which mainly deal with rainfall and temperature, will cause significant changes for moisture stored in the soil and also for surface and ground water resources. In this study, the effects of climate change on soil moisture were simulated by an agrohydrological model, and then some definitive scenario analysis performed by this model in the light of climate change projections for Mediterranean region. The SWAP model was used with a data set of soil-climate-plant, and the soil moisture was monitored according to soil properties of the layers in a selected area on an alluvial soil in the province of Aydın during the summer cultivation period of the year of 2012. According to the results from scenario analysis, it was estimated that the evaporation from soil and transpiration from plants will increase potentially and there will be a water movement upward from high water table to the root zone to meet this increasing demand.