Sandoval pitched the last two seasons in the Mexican League and marked his return to the United States on Saturday.
The Biscuits, down 1-0, scored in the fifth and sixth innings on sacrifice flies. Shawn O'Malley knocked in Mark Thomas in the fifth. Mikie Mahtook hit a leadoff triple in the sixth and came home on Todd Glaesmann's flyout.
Biscuits starter Enny Romero gave up one hit and an unearned run in four innings. Neil Schenk threw two innings and was the winning pitcher. C.J. Riefenhauser's perfect, 11-pitch ninth finished it.
UPDATED to fix brain cramp.