Abstract: Harnessing the power of ocean waves holds great promise for sustainable electricity generation. There is abundant sea wave energy around Sri Lanka as an island nation. There are numerous sea wave energy harnessing techniques implemented around the world. This study delves into buoyancy-driven wave energy conversion systems, specifically focusing on the up-pumping method. We explored how different shapes of buoys—cylindrical, spherical, and cubical—can optimize energy capture. Additionally, we investigated how placing a steel buoyancy cover at different heights within each buoy affects performance.