Sea level rise is a major problem in coastal Java, Indonesia, including the cities of Jakarta, Semarang, Pekalongan, and Demak. The loss of lands and properties poses serious threats to local communities, which frequently results in environmental migration. Forced environmental migration is a pressing human security problem, but one that lacks serious attention in current law and policy. This chapter examines the adequacy of law and policy in addressing forced migration as it relates to sea level rise. Case studies in Pekalongan, Semarang, and Demak highlight the institutional, cultural, and economic challenges and showcase some initiatives in addressing the problem. The research methodology includes a literature review, law and policy analysis, and in-depth interviews with stakeholders such as community members, government officials, and NGOs. The results indicate that addressing the problem of Internally Displaced Persons (IDPs) requires a reform in law and regulation, as there is no protection specifically for IDPs as a result of climate change. The current Disaster Management Law does not recognise SLR as a disaster, and the protection afforded to displaced people is therefore inadequate; stronger laws to address migration as a result of climate change are urgently needed.