SUSTAIN-AI Malaysia is an AI-powered decision support platform designed to support sustainable tourism planning through official Malaysian data. It integrates an interactive website, Power BI dashboard, regional tourism demand indicators, machine learning analysis, and an AI evidence assistant called TAPi. Users can explore tourism patterns across Malaysian states, compare regional demand, examine model results, and understand the evidence behind each finding. Its key innovation is combining transparent predictive modelling with practical decision support. The platform evaluates multiple machine learning models, reports prediction errors, and clearly distinguishes observed data from experimental projections. Its Decision Lab transforms regional findings into evidence-based investigation priorities, while the Evidence Centre documents data sources, methods, and limitations. Guided by the framework “Observe. Predict. Explain. Act.”, SUSTAIN-AI Malaysia aims to improve tourism data accessibility, encourage responsible AI adoption, and help stakeholders make more informed decisions for sustainable tourism development in Malaysia.