Sandor Martínez-Breijo (born 21 March 1981) is a Cuban former professional tennis player.

Martínez holds the Cuban record for the most Davis Cup appearances, featuring in a total of 29 ties between 1998 and 2009.

He is the team's most successful doubles player, with 18 wins in doubles rubbers, to go with his four singles wins.

[1] At the 1998 Central American and Caribbean Games, Martínez won a gold medal for Cuba in the team event, alongside Lázaro Navarro and Juan Pino.

He also represented Cuba in the 1999 and 2007 editions of the Pan American Games.