The Muara Beting coastal area on the north coast of Java, Indonesia, faces coastal erosion processes that gradually affect the decrease of mangrove land. That process causes the land to be extremely eroded and become closer to the Citarum River. The seawater intrusion occurs within the decreasing land mangroves. If erosion persists, the increased seawater intrusion might result in the convergence of the pond area with the Citarum River. This study aims to simulate and analyze how the “Building with Nature” building can be applied as a mitigation strategy through Delft3D simulations. Data was collected through field surveys, satellite image analysis, and library observations to evaluate the impact of the proposed solutions. The simulations used bathymetry, sediment characteristics, wind, tide, and river discharge measurements for input data. Apart from simulating natural conditions, several scenarios were also arranged based on the placement of permeable structures combined with the floodway. The best scenario was selected from where cumulative sedimentation and erosion and the cross-sectional depth show best. This study's findings will be intended to assist Muara Beting’s coastal community in reconstructing pond land that has been harmed by coastal erosion, allowing the locals to carry on with their pond-related livelihoods.