South Carolina Offshore Drilling Act of 2013 - Directs the Secretary of the Interior, when determining the areas off the coast of South Carolina that are to be made available for leasing under Final Outer Continental Shelf Oil & Gas Leasing Program (2012-2017), to: (1) consider the laws, goals, and policies of the state of South Carolina; and (2) focus upon areas considered to have the most geologically promising energy resources.