Sang Ruj (, also Romanized as Sang Rà «j; also known as Sang Karà «ch, Sang Rà «ch, and Sankarà «ch) is a village in Shohada Rural District, Yaneh Sar District, Behshahr County, Mazandaran Province, Iran. At the 2016 census, its population was 155, in 55 families. Down from 184 in 2006.