Abstract Intertidal zones of the Ganges‐Brahmaputra (GB) delta are among the most active coastal environments worldwide, and quantifying their morphological evolution remains challenging due to rapid change and scarce in situ observations. This study presents a satellite‐based direct quantification of intertidal sediment volume change in the Meghna Estuary of the GB delta using the Surface Water and Ocean Topography (SWOT) altimetry mission. Originally designed to observe fine‐scale ocean dynamics and inland hydrology, SWOT also allows accurate mapping of intertidal topography. Using SWOT‐based intertidal topography, this study assesses elevation change and associated sediment erosion and accretion volume over a 1‐year interval (2024–2025). The analysis reveals a net sediment change of 70.32 ± 0.12 Megatonnes with distinct island‐scale and local‐scale sediment redistribution patterns. Consistent spatial patterns observed from overlapping different SWOT passes support the robustness of the derived changes, demonstrating a powerful approach for monitoring rapidly evolving intertidal changes across the world’s coastline.