Homeland Security Technology Improvement Act of 2003 - Amends the Homeland Security Act of 2002 to include as a component of the technological innovation program of the Department of Homeland Security a multi-agency homeland security technology transfer program to transfer technology, equipment, and information to State, regional, and local fire, emergency medical service, and law enforcement agencies. Requires the Secretary of Homeland Security, acting through the Under Secretary for Science and Technology, to: (1) research, develop, test, and evaluate technologies that significantly improve the capability of such agencies in countering terrorist threats and traditional threats not related to terrorism; (2) provide a comprehensive list of available technologies to the Office for Domestic Preparedness (ODP); (3) work with the Secretary of Defense to evaluate and transfer to Federal, State, regional, and local fire, emergency medical service, and law enforcement personnel Department of Defense technologies and equipment for homeland security purposes; and (4) establish a technology transfer program advisory committee. Requires the Director of ODP to administer the program.