Sandlin (shoulder) was transferred to the 60-day injured list Friday, Zack Meisel of The Athletic reports.
The transaction officially ends Sandlin's season, as he hit the 10-day injured list with a strained right shoulder in mid-August. He'll finish his rookie season with a strong 2.94 ERA and 34.0 percent strikeout rate in 33.2 innings, though the shoulder issue could be something to worry about heading into next season.