Rodney Arens, who is 36, has also been issued a 10-year driving ban.
He was found guilty earlier this week on five charges, including impaired and dangerous driving causing death, in a crash at a Red Deer intersection on July 1, 2010.
Arens broke into tears during his sentencing hearing when he told the boy's family he was sorry.
Jeffrey Chanminaraj (Chan-MIHN'-ehr-azh), who was a passenger in a car heading to a fireworks display, was killed and his older brother Jamie was injured.
Court heard Arens was behind the wheel of a truck that slammed into the car at 80 kilometres an hour.
Hundreds of people were in the area going to Canada Day festivities. Witnesses testified Arens had sped up as the traffic light turned from green to yellow.
The Crown had asked for a global sentence of six years in prison, while the defence had suggested a sentence of four years.
Jeffrey was in the front-seat of the car and was killed on impact. His brother Jamie was severely injured and was airlifted to Foothills Hospital in Calgary. The car's driver, their 20-year-old sister Stephanie, was also treated for injuries.
The surviving Chanminaraj siblings declined to comment.
(CHUB, The Canadian Press)