Vaguely resembles a member of the Family Spionidae: Prionospio sp. The image is not sufficiently detailed enough to enable one to arrive at a conclusion. However, superficially it does look like a spionid polychaete.
Hello Ashan; Your specimen is missing a number of body parts...parapodia and the posterior part of the body. If you have more specimens It might help with identification. Best regards, Jim Des Lauriers