This study is conducted by the researchers to identify whether sustainable coastal tourism for biodiversity conservation is evident in the island of Maniwaya in Sta. Cruz, Marinduque. The Philippine tourism industry is a major source of all kinds of recreational and income-generating activities, and biodiversity is then recognized as vital to tourism. That is why the researchers try to study Maniwaya Island and what’s new in it and how it will affect the biodiversity of the island. The researchers used descriptive design and quantitative method to identify the level of compliance and implementation of existing laws, rules, and regulations which overall aim is to achieve sustainable coastal tourism for biodiversity conservation in the Island. Results revealed that the level of compliance in terms of the residents and barangay official’s perspective is satisfactorily compliant and above compliant on the part of the resort owners. As for the level of implementation of Chapter Vol. 32 · July 2020 Print ISSN 2244-1573 · Online ISSN 2244-1581 International Peer Reviewed Journal Journal Metrics: H Index = 2 from Publish or Perish This journal is included in Thomson Reuters Journal Masterlist Published by IAMURE Multidisciplinary Research, an ISO 9001:2008 certified by the AJA Registrars Inc. IV Section 27 of Republic Act 9147 of 2001 among concerned inter-agencies in Maniwaya Island, it is clearly shown thru the results that they are in an advanced level of implementation. It was recommended that the concerned inter-agencies should work hand in hand to further strictly implement existing policies and promulgate new policies, guidelines, and ordinances.