Soares died after suffering a massive heart attack, said Goa Football Association president Shrinivas Dempo.
The 65-year-old is survived by his wife, two daughters and two sons. Soares, who played as a striker for Vasco SC, was a well-known figure among the Goan soccer fans.
During his heydays, he was a part of the famed "ABCD" formation comprising Andrew, Bernard, Catao and himself (Domnic) which won numerous trophies for the Club.
His sublime skills and ability to get past the opponent's defence saw him score many goals.
"He also represented Goa in Santosh Trophy and other national championships," Shrinivas Dempo, who is Director of Dempo Sports Club, said in his condolence message.