The rapid development of blockchain has given rise to smart contracts that challenge traditional legal doctrine, even though the technology is crucial to supporting SDGs (Sustainable Development Goals) 9 and 16. Purpose: This study aims to analyze smart contract governance in Indonesia, Malaysia, and Thailand to support the achievement of the SDGs in the region. Method: A normative-comparative legal method is used with a socio-legal approach. This study examines the synchronization of regulations and the socio-institutional impacts. Results: The validity of smart contracts in the three countries is interpretative due to the lack of specific regulations. The self-executing and immutable nature triggers doctrinal tensions related to agreements and consumer protection, which are increased by the digital literacy gap. Conclusion: Smart contract governance in Southeast Asia requires an adaptive regulatory strategy that balances innovation and legal certainty. Suggestion: Authorities are expected to develop co-regulation-based regulations, strengthen digital institutions, and initiate regional legal standardization across ASEAN (Association of Southeast Nations). Contributions: The contribution is in the development of a blueprint for regional digital law harmonization that integrates aspects of dogmatic law with legal sociology. This study offers a model for ASEAN legal standardization that bridges technological innovation with social justice and provides indicators of institutional readiness replicated by developing countries in embracing an inclusive and sustainable digital economy.