Sormunen began curling in 1996. She was a national junior champion in 2004 and 2007.
Sormunen skipped a team at the 2005 United States Olympic Curling Trials and qualified for the playoffs in fourth place, but lost her page playoffs game against Patti Lank. She also competed at the 2010 United States Olympic Curling Trials, but finished outside of the playoffs at fifth place. She then played as third for Patti Lank at the 2010 United States Women's Curling Championship, and finished as the runner-up to Erika Brown.
Sormunen skipped her own team at the 2011 and 2012 United States Women's Curling Championships, finishing sixth and fourth, respectively. She and her then-third Courtney Georgeswitched positions the next year, and finished second at the 2013 United States Women's Curling Championship. Consequently, she and her team were selected to participate at the 2014 United States Olympic Curling Trials by the national High Performance Program committee.
Sormunen has a degree in organizational management from the University of Minnesota Duluth. She is currently an insurance servicing agent with Liscomb Hood Mason Company.
|2005–06||Aileen Sormunen||Courtney George||Amanda Jensen||Amanda McLean||2005 USOCT|
|2008–09||Aileen Sormunen||Molly Bonner||Jessica Schultz||Maureen Brunt||2009 USOCT|
|2009–10||Patti Lank||Aileen Sormunen||Caitlin Maroldo||Jessica Schultz||2010 USNCC|
|2010–11||Aileen Sormunen||Courtney George||Amanda McLean||Miranda Solem||2011 USNCC|
|2011–12||Aileen Sormunen||Courtney George||Amanda McLean||Miranda Solem||2012 USNCC|
|2012–13||Courtney George||Aileen Sormunen||Amanda McLean||Julie Lilla||2013 USNCC|
|2013–14||Courtney George||Aileen Sormunen||Amanda McLean||Monica Walker|