The 14-time All-Star signed an agreement Wednesday to play in the 2009 tournament, Puerto Rico general manager Lou Melendez said.
Rodriguez recently ended a more than decade-long absence to return home to play in the island's winter league.
Rodriguez, St. Louis catcher Yadier Molina and Phillies reliever J.C. Romero were the first three players to sign up for their Caribbean homeland's team, Melendez said.
"Here we are all major leaguers and all deserve to play. I am prepared to play any position," the 37-year-old Rodriguez said.
Rodriguez was traded from Detroit to the New York Yankees during last season and hit .276 overall with seven home runs and 35 RBIs. He is currently a free agent.
Melendez said Carlos Delgado and Carlos Beltran of the New York Mets were expected to sign up in coming days.
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