Sandercock was critical of referee Thierry Alibert and his touch judges following Rovers' 50-30 loss at the hands of Huddersfield.
He said: "I'm still scratching my head over some of the decisions. If the touch judge can't see a forward pass from five metres away when it was 32-24 to Huddersfield then that's embarrassing for the RFL."
Sandercock was happier with the performance of his side, though.
They scored five of the 13 tries in an entertaining encounter at John Smith's Stadium, Greg Eden grabbing a brace for the visitors with Craig Hall, Constantine Mika and Josh Hodgson also getting on the scoresheet.
"It was tough against classy opposition but I thought we scored some classy tries of our own," Sandercock said.
Huddersfield, meanwhile, kept up the pressure on leaders Wigan with the victory which featured nine successful goal kicks from Danny Brough in a swirling wind.
Shaun Lunt scored two of the tries and made another while Joe Wardle also collected a brace, with Huddersfield's other touchdowns coming from Craig Kopczak, Michael Lawrence, Scott Grix and Brett Ferres.
Giants coach Paul Anderson said: "We went 20-0 up and then got carried away and let them back in it.
"We've got to put teams to bed. And we've got to keep an eye on the points difference. To concede 30 points at home is not good enough. We've now shipped nearly 60 points in the last two matches. With where we want to go, that's simply not acceptable."
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