The Spanish playmaker was booked for simulation after going down in the box during Saturday's 2-2 draw.
Sherwood was speaking to the club’s official website following the match at Villa Park, having seen his side attempt 21 shots on goal over the course of the match but prove unable to find a response to Sunderland forward Jeremain Lens’ second-half equaliser.
The visitors had taken an eighth-minute lead through Yann M’Vila’s powerful free kick but Scott Sinclair levelled things up just three minutes later from the spot after drawing a foul in the area.
The in-form winger then put Villa in front four minutes before the break after tapping in Jordan Amavi’s pinpoint cross but their lead would last just seven minutes into the second-half before Lens fired in from close range.
Sherwood thought his side had a chance to win the game with another spot-kick, though, when substitute Gil tumbled under a challenge from Younes Kaboul in the box with 12 minutes left.
Referee Robert Madley ended up booking the 22-year-old Spaniard for simulation instead of pointing to the spot, however, and the Villa boss was adamant that he made the wrong decision.
“I think it's a penalty otherwise he just rolls it in the net,” said Sherwood. “Why would he go down? He's clean through. I have asked Carles in there and he said there was contact. I think Younes tries to pull out and stops.
“If there is contact I think you're entitled to go to ground. We would then have perhaps got what we deserved.”
In fact, Sherwood was so convinced that Kaboul’s challenge was a foul that he even ended up injuring himself while railing against the decision to turn down their appeal.
“I've done my hamstring,” he continued. “I never did it as a player. I was going to kick the bottles forward but there were too many people so I thought I'd be polite and backheel them and snapped my hamstring.
“It feels bad. I must have looked like a spoiled brat. I tell my kids not to behave like that. Before today, I thought I had calmed down.”
The draw means Villa go into the international break with four points from their first four Premier League games but, after putting in their best performance of the season against the Black Cats, Sherwood believes his revamped squad is well-positioned for the coming months.
“I can be disappointed that we didn't get the three points but I can tell the lads that there were a lot of good performances out there - some excellent performances,” he added. “It was very encouraging for me to see that what we have been working on at the training ground was applied today.”