In April 2004, Simioni was appointed head coach of German first-division side Krefeld Pinguine, but was sacked only some months later, in October, after having won only three of the ten opening games of the 2004-05 season. He returned to Denmark and took over head coaching duties at SønderjyskE in December 2005, kicking off a "golden era". Under Simioni's guidance, the club which he had played for in the late 1990s (named Vojens IK back then) won four Danish championships (2006, 2009, 2010, 2013), four bronze medals (2007, 2008, 2011, 2012), three Danish Cup titles (2010, 2011, 2013) and one bronze medal in the 2010-11 IIHF Continental Cup. He parted ways with SønderjyskE following the 2012-13 season.
