The sand goby (Pomatoschistus minutus), also known as a polewig or pollybait, is a species of ray-finned fish native to marine and brackish European waters from the Baltic Sea through the Mediterranean Sea and into the Black Sea where it occurs in sandy or muddy areas of inshore waters at depths of from 4 to 200 metres (13 to 656 ft).

Pomatoschistus minutus is a spawning and thermal migratory species. It is usually found on sandy or muddy bottoms to a depth of about 20 m, but may occur up to 60-70 m depths. Pomatoschistus minutus is sometimes considered to form a species complex with Pomatoschistus norvegicus and Pomatoschistus lozanoi.