Matthew Llewellyn, 27, of Gilfach Goch, Rhondda Cynon Taff, previously admitted failing to stop at an accident and other offences.
Tye Hawkins was left with life-changing injuries after the crash in Mountain Ash, in September 2015.
Merthyr Tydfil Crown Court heard Llewellyn went on to dump the bike and said he was in Scotland at the time.
The court heard Tye was crossing the road with his mother from behind a school bus when he was hit by Llewellyn's 600cc Suzuki motorcycle.
Llewellyn failed to stop and drove 11 miles (18km) away before ditching the bike and hiring a car to get away.
When he was eventually traced two weeks later, he denied any involvement and claimed to have been in Scotland at the time.
The court heard another man was arrested as part of the investigation as a result of the false information he gave police.
He eventually admitted owning the motorcycle but claimed he had sold it, before later admitting his part in the crash.
The court heard Tye suffered a blunt head injury which caused bruising to his brain, along with other fractures and lacerations.
He spent 17 days in intensive care and is preparing to spend three months at a specialist brain injury recovery centre in Surrey, which it is hoped will help him regain movement.
In a victim impact statement, his mother Clair told the court the months since the crash had been "the worst of my life".
"Seeing him struck has haunted me. I have seen changes in Tye, he finds it difficult to concentrate, he hallucinates and needs help to dress," the statement added.
The court was told Llewellyn had written to Tye's family to express his remorse and admitted leaving the scene was "totally reprehensible".
Sentencing Llewellyn, Judge Daniel Williams, said he had showed "no concern for this young lad and every concern for your self preservation".
Llewellyn was sentenced for attempting to pervert the course of justice, driving without insurance and failing to surrender in relation to the crash.
He was also banned from driving for 12 months.

Batsman Weatherley and leg spinner Crane, both 18, have both penned two-year development deals keeping them at the Ageas Bowl until 2017.
Crane made his first team debut earlier this month in the T20 Blast and his County Championship debut in the current match against Durham.
Weatherley captained England Under-19s on their tour of Australia last winter.
Crane has also been selected in the England Under-19 Test and one-day squads to face Australia later this summer.
"It's great all my hard work has started to pay off," Crane told BBC Radio Solent.
"Hopefully the contract can lead to more opportunities in the first team and it's the first step on the ladder to making it.
"It's a nice surprise it's happened now, I was expecting it to possibly come at the end of the season."

The incident involving the 10:13 service happened close to Inverurie.
ScotRail Alliance said no-one was injured in the collision, but that the damage included a smashed windscreen and engine failure.
Services between Aberdeen, Inverurie and Inverness were affected until early afternoon.
A ScotRail Alliance spokesperson said: "Due to a train hitting a tree between Aberdeen and Inverness services along the route are disrupted.
"We have replacement buses in place to get our customers where they need to be.
"We apologise to anyone delayed by this incident."
A motorcyclist who left a 10-year-old boy with brain injuries after a hit-and-run has been jailed for 15 months.
[NEXT_CONCEPT]
Hampshire youngsters Joe Weatherley and Mason Crane have signed their first professional contracts with the club.
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Rail service have been disrupted after an Aberdeen to Inverness train was damaged when it hit a fallen tree in Aberdeenshire.