Tiisanoja competed in the 2004 Olympic Games in Athens, where he did not make it to the final round and ended up placing 19th thanks to his put of 19.50 in the qualifiers.
Tiisanoja was the 15th member to be inducted into the 20 meter club after he successfully putted the shot 20.06 m in a competition on 31 July 1999 in Espoo, Finland.
Tiisanoja and discus thrower Timo Tompuri were caught by the French Customs Authorities in spring 2002 with doping substances (4 ampules of testosterone, 38 tablets of ephedrine, 44 tablets of clenbuterol and 245 tablets of melatonin) in their car when they were returning from training in Spain; they denied all involvement and were left off with a warning even though the Legal Protection Board of Sport in Finland stated in their decision that it was extremely unlikely that someone would have been able to stash doping substances in their luggage by accident or without their knowledge that are abused in their sports events.
For this reason, the Legal Protection Board did not consider it credible that Tiisanoja and Tompuri did not know about the doping substances in their car.
Tiisanoja is attributing his decision to use a banned substance to his desire to attain the levels he had previously reached in international competitions after a dismal indoors season.