The 20-year-old has been solid for the Owls when called upon.
The Owls stopper has been called up to the squad on a couple of occasions but is yet to make his debut for Gareth Southgate's side. And he suggested that getting that opportunity is one of his main targets currently.
"It would be brilliant to play for the U21s," he told the Star.
"I've had a taste for it at U20 level and there's no better feeling than playing for your country. It is just a massive privilege.
"It is an indication of what you are doing at club level so hopefully I can keep doing well for Wednesday and I will get the accolades at national team level."
Although the 20-year-old has not played for the Championship side since January, his form when called upon this term has been hugely impressive and has hinted that he could be a very special talent in the future.
He has featured 12 times for Wednesday this season in all competitions and has kept clean sheets on five occasions, including in the Capital One Cup victories over Newcastle and Arsenal earlier in the campaign.
And while Keiren Westwood's quality and experience understandably makes him the number one when available, the fact that Wildsmith has performed so well when needed has seemingly given Carlos Carvalhal the confidence to make him the Irishman's first understudy - ahead of Lewis Price and Cameron Dawson - and may soon give Southgate a reason to give him a chance for the national side.