Gulf of the Farallones and Cordell Bank National Marine Sanctuaries Boundary Modification and Protection Act

Gulf of the Farallones and Cordell Bank National Marine Sanctuaries Boundary Modification and Protection Act - Declares that it is U.S. policy to protect and preserve living and other resources of the Gulf of the Farallones National Marine Sanctuary (Farallones NMS) and Cordell Bank National Marine Sanctuary (Cordell Bank NMS) marine environments.

Makes certain adjustments to expand the boundaries of the Farallones NMS and the Cordell NMS.

Prohibits the issuance of a lease or permit authorizing mineral or hydrocarbon exploration, development, production, or transportation by pipeline within the sanctuaries.

Directs the Secretary of Commerce to complete: (1) an interim supplemental management plan for the sanctuaries that focuses on protective resource management in the areas added by this Act; and (2) a revised comprehensive management plan for the sanctuaries.

Directs the Secretary to carry out an assessment of necessary revisions to the regulations for the sanctuaries, including considering regulations regarding the deposit or release of introduced species and the alteration of stream and river drainage into the sanctuaries.