River Goby
Awaous tajasica
- Least concern
- Card rarity: Common
- Fish

Awaous tajasica, the sand fish or sandfish, is a species of goby native to fresh and brackish waters of Brazil in South America with reports outside of Brazil considered to be questionable. This species can reach a length of 16.3 cm (6.4 in) SL.
Classification
- Class
- Actinopterygii
- Order
- Gobiiformes
- Family
- Oxudercidae
- Genus
- Awaous