the philadelphia phillies selected sandberg with the 89th pick in the third round of the 2013 major league baseball draft. he signed and spent 2013 with the gcl phillies where he batted .207 with two home runs and 14 rbis in 48 games. he spent 2014 with the williamsport crosscutters where he slashed .235/.267/345 with six home runs and 24 rbis in 66 games, 2015 with the lakewood blueclaws where he compiled a .255 batting average with five home runs and 59 rbis in 129 games, and 2016 with the clearwater threshers where he posted a .230 batting average with four home runs and 23 rbis in 94 games. in 2017, sandberg played for lakewood, clearwater, and the reading fightin phils where he batted a combined .268 with nine home runs and 42 rbis in 105 total games between the three teams.