The 2013 season will mark Rodriguez's 19th with the organization, but first on the Major League staff.
Earlier this week, the Sox selected Greg Colbrunn as their new hitting coach.
The Red Sox have joined a new wave of thinking, that two hitting coaches is necessary for peak efficiency.
"I think the most important thing is when you consider an assistant hitting coach is they've got to be aligned in their overall thoughts as far as hitting goes," Red Sox manager John Farrell said earlier this week. "We can't have conflicting messages to the individuals. And once that rapport is built with those two staff members, now it gives the ability to have that trust."
Rodriguez was Boston's Minor League coordinator for the last six years. Before that, he was the team's Latin field coordinator for three years, and has also served several other roles in the organization over the years.
The New York City native was originally signed by the Orioles in 1977 and played professionally for 19 seasons, including 17 games in the Majors.