Mikkelsen is the latest in a flood of Danes to grace the A-League's shores, linking up with another former Danish Dynamo, Thomas Kristensen, in a revamped Roar outfit.
The 31-year-old winger's former credits include a string of top flight Scandinavian clubs - Brondby, Rosenborg and most recently Nordsjaelland, in addition to Greuther Furth from Germany. 
“I know I’ve signed for a great Club. I feel that I still have a lot to achieve and I will always do my best to be a better player. I can’t wait to train and play with my new teammates,” Mikkelsen said.
“This is an excellent opportunity for my family and I to come to Australia and I’m looking forward to playing for such a successful side.
“I’d like to thank the coaching staff & players for making me feel so welcome and I can’t wait for the new season to start and play for the Brisbane Roar fans.”
Mikkelsen joins a fresh-faced Roar attacking lineup boasting some pedigree, including Frenchman Eric Bautheac, formerly of Lille, and fringe Socceroo Adam Taggart, who has 20 goals in his last 38 A-League appearances.
“We are pleased to have signed another high-calibre footballer who has not only played for his country, but at the highest level for nearly 15 years,” coach John Aloisi said.
“His experience will be invaluable as we continue to build strongly for season 2018/19.
“Tobias will provide another attacking option in the front third for our talented side as we prepare for another successful campaign.”