Schlopp has signed a three year contract with Barnsley, where he will have a tough act to follow.
Schlopp has managed clubs such as Sturm Graz and St. Polten, before taking on the TSV Hartberg job in Austria in 2018.
His side finished seventh in the country's Bundesliga last season.
"It's great to come to a country where football is so big, so traditional, especially in South Yorkshire," Schopp said in a club statement.
"I appreciate this opportunity a lot and I look forward to getting to work, meeting the team and coaching staff and seeing the supporters back in the stadium soon."
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