High-resolution bathymetric and seismic reflection data reveal the presence of diverse sand waves in the offshore wind farm area of the Taiwan Strait. Five consecutive surveys examined the characteristics and temporal changes of sand waves near the Zhuoshui River, the largest river in Taiwan with high sediment yield. The characteristics of sand waves are quantified, and their migration significantly affects seabed levels, with a maximum elevation difference of 6.70 m and a migration distance of 89.40 m observed from April 2016 to July 2018. The seabed evolution shows uneven patterns over various time scales-approximately 27 months, two months, and two weeks-reflecting changes in sand wave migration. The study examines sand wave formation related to currents and large-scaled bedform topography, considering seasonal variations, tidal cycles, and extreme events. A time-to-depth sound velocity function was derived using seismic data for the offshore area. By integrating sequence stratigraphy with high-resolution seismic profiles, it was found that sand waves migrate above a basal surface 5 to 15 m below the seabed. A four-stage model is proposed to explain sand wave evolution and depositional changes since the Last Glacial Maximum, aiding in evaluating geo-risk for offshore wind farm constructions.