Southern Border Security Task Force Act of 2009 - Directs the Secretary of Homeland Security to: (1) establish a Southern Border Security Task Force to coordinate the efforts of federal, state, and local border and law enforcement officials and task forces to protect U.S. border cities and communities from violence associated with drug trafficking, gunrunning, illegal alien smuggling, violence, and kidnapping along and across the international border between the United States and Mexico; and (2) deploy the Task Force along that border in cities and communities most affected by violence.