Rovers staged a second-half comeback at Craven Park on Sunday to inflict the first defeat of the season on the Wolves.
"We're not getting carried away by this result," Sandercock told Sky Sports News. "Warrington had quite a few players out and that stifled their attack.
"But I want to give full credit to my players. The boys played well today after getting an even share of the play and penalties and we did some little things well."
The victory has lifted Hull up to eighth place in the Super League table.