Lukauskis began his basketball career in the Panevežys youth basketball clubs, being the leader there. He got attention from the LKL, and in 2001, he joined Sakalai. In 2002, he signed a one year contract with Alytus, and he was the top scorer on the team. In 2003, he joined Lithuanian basketball giant Lietuvos Rytas. In 2006, Lukauskis improved his game and alongside Tomas Delininkaitis he gave Rytas a strong impact off the bench. In the 2007 season, he became a starting player. Lukauskis was a member of the Lithuanian national team at the 2008 Summer Olympics in Beijing. On August 16, 2008, when Lithuania played against Croatia in the Olympics, Lukauskis helped Lithuania to win the game by scoring 20 points.
In the Eurocup Final 8 on April 4, 2009, Lukauskis made a decisive, game-winning, 10 meters distance three-pointer and that allowed him to become the only player to participate in the Eurocup Final three times in total. He then went on to become the only two-time Eurocup champion. In July 2009, he joined the French League club ASVEL. In September 2010 he signed with the German Eurocup-Team Baskets Oldenburg.
After spending a season with Italy's Barcellona Sigma of Legadue, in September 2012 Lukauskis moved to Valencia Basket for signing contract during the injury of Thomas Kelati.