Sonia Molanes Costa (born May 28, 1980 in Cangas de Morrazo) is a Spanish sprint canoer who has competed since the early 2000's. She won eight medals at the ICF Canoe Sprint World Championships with two golds (K-2 200 m: 2001, 2002), a silver (K-4 200 m: 2002), and five bronzes (K-2 500 m: 2001, 2002; K-2 1000 m: 2001, K-4 500 m: 2002, 2009).