The South Branch Sandy River is a short tributary of the Sandy River in Franklin County, Maine. From its source (44°46′20″N 70°28′41″W / 44.7721°N 70.4780°W) on Blueberry Mountain in Berlin (Township 6 north of Weld), the river runs 7.4 miles (11.9 km) northeast to its confluence with the Sandy River in Phillips.