This study aims to assess the role of hotel departments in adapting to sustainable tourism indicators based on the resource conservation principle of Conservation of Resources (COR) Theory. Using the Best Worst Method (BWM) and Fuzzy TOPSIS, the findings reveal that waste management and reducing greenhouse gas emissions are top priorities. Results show that no single department dominates; instead, each contributes at varying levels. By applying COR theory at the departmental level in hotels, the study provides valuable insights into resource-efficient sustainability practices, offering a significant contribution to both academic literature and practical tourism management. The study offers managerial guidance on effective resource allocation, departmental collaboration, and policy integration to advance sustainability in hotels. It also emphasizes that cooperation among departments fosters social sustainability by enhancing awareness, accountability, and shared responsibility, contributing to long-term ecological and social goals in the hospitality sector.