The Watford youth product found himself on the bench against Rovers after failing to find the net in four league starts this season.
But his introduction after 55 minutes sparked Malky Mackay's side into life, putting them 2-1 ahead through a header from Don Cowie's cross and a right-footed strike from the edge of the area.
"I'm not really used to scoring a lot of headers, but I've been practising a lot in training," Sordell explained
"The second I gathered from Danny's hard work to go and close down the keeper, and when it came to me I just turned and hit it. It was instinct."
Watford will hope to recover from George Friend's late equaliser for Doncaster when they travel to Bristol City on Tuesday.
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