Over the past 30 years, the coastal landscapes of Hatiya and Manpura islands in Bangladesh have undergone significant changes, affecting the amount of carbon stored in the environment. This study used satellite images from the Landsat Satellite to examine changes in land use and land cover (such as vegetation, agricultural land, and water bodies) before and after the monsoon seasons. To assess the impact on carbon storage, the researchers used a model called InVEST, which helps measure ecosystem services like carbon sequestration. The study found that agricultural land, vegetation, and built-up areas increased over time, while water bodies decreased. Vegetation and water bodies stored the most carbon, followed by agricultural areas and urban developments. Hatiya Island had higher carbon storage than Manpura Island, with the total carbon stored in the study area amounting to 6,822.95 Mg/hm² over three decades. These findings emphasize the importance of protecting and restoring ecosystems to maintain carbon storage and enhance environmental health. The results provide valuable insights for land-use planning, policies, and actions to address the ongoing environmental changes and ensure the sustainability of these coastal areas.