Rovers kept Tony Smith's side scoreless in the second half and kept them to just two tries during the entire game. Sandercock was pleased his side returned to winning ways after last week's disappointing defeat at Salford.
"We're not getting carried away by this result," Sandercock said.
"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 after getting an even share of the play and penalties and we did some little things well.
"I just want to win every game we play and you want your players to stick to the gameplan and play to their potential, and my players did that."
Warrington coach Tony Smith was disappointed at losing his unbeaten start to the season but admitted his side did not click as they have in recent weeks.
"We weren't quiet sharp enough and didn't start the game as we would have liked," Smith said. "We did well to fight back and go in at half-time with a lead. They had some things they were trying to get over and they were desperate. It showed in the way they played and sometimes desperate like that can be enough."
Smith felt his side would face a determined Rovers side, who threw away a 20-point lead in their 38-34 defeat at Salford last week.
"We understood they would be up for it after a tough week," Smith added. "We needed to be a lot better disciplined and we needed to control where the game was played.
"When you come to Hull KR, it's a tough place to go to. It's a hostile environment unless you take good control but we didn't do that. We'll lick our wounds and dust ourselves off for next week."