The coastal region is very dynamic in its environmental nature, which undergoes continuous geomorphological changes by the natural and man-made processes, i.e., waves, tides, storm surges, and climate change impacts. Erosion-accretion vulnerable zonation mapping is a very crucial spatial analysis program where the land loss and gain areas are easily quantified due to the shoreline modification over a certain time period. Multi-temporal satellite data, historical data, and field data are applied to quantify the change rate. Various statistical methods are used to estimate the rate of retreat in shoreline, i.e., Net Shoreline Movement (NSM), End Point Rate (EPR), and Linear Regression Rate (LRR). The present chapter follows the NSM method to find out the erosion-accretion zones in the Indian Sundarbans region with a long-term change rate (2000–2020) time period. The result of the analysis shows that five distinct classes have been classified to show the erosion-accretion hazard zone, i.e., high erosion, moderate erosion, low erosion, low accretion, and high accretion zones, by providing the erosion-accretion hazard zonation mapping as an essential tool for coastal zone management, sustainable development, risk reduction, and mitigation resilience of coastal habitats.