Södra Sunderbyn is a locality situated in Luleå Municipality, Norrbotten County, Sweden with 2,977 inhabitants in 2010.

The new area of Hammaren almost joins the village to Gammelstad and is regularly visited by city buses from Luleå public transportation.

The timber rafting operations which took place from Grundet island is also a well-known former local business; these started around 1934 and ended late in 1987.

Sunderbyn has one club Sunderby SK that offers activities including ice hockey, football, skiing and basketball.

In the last of these, the sports association has achieved great success in youth SM (Swedish Championship) but also in the Scania Cup.

This training park was meant to be "a sports mecca for young and old" in the village but when the money from the municipality did not seem to be enough, this idea had to be dropped until further notice.

Sunderbyns scout group sells majblommor (may flower) and 2009 they received a diploma from Queen Silvia of Sweden in a ceremony.