The 41-year-old is the first Israeli politician to be jailed for breaking strict party campaign laws.
Magistrates in Tel Aviv have also ordered an additional nine-month suspended sentence and fined 300,000 shekels ($A88,291.23).
Edna Bekenstein, the president of the Tel Aviv district court,
said Omri could delay the start of his sentence until August 31.
Such a delay would give him the chance to spend time with his seriously ill father who remains in a coma.
His lawyers immediately announced their intention to appeal.
Omri accused the court of hanging him out to dry merely because he was so high profile.
"It's a severe punishment. Had it not been Omri Sharon it would
not have been the same severity," he told reporters at the court.
Omri pleaded guilty to providing false testimony, falsifying
documents and violating the electoral campaigns law last year after a probe into the financing of his father's 1999 campaign for the leadership of the Likud party.
Delivering the sentence, Magistrate Bekenstein said Omri Sharon tirelessly spun a web of deceit in order to raise unlimited funds for his father's campaign, and insisted that his sentence would serve as a warning and lesson to others.
"He knowingly made his father sign false statements he actively
endangered the democratic process.
"This sentence has a very important impact in draining the
political swamp. His crimes had an impact on the entire nation
which enhances their severity."
The sentence was welcomed by state prosecutor Erez Nurieli who
pressed for jail time for the former MP, who was forced to resign
his seat in parliament for the right-wing Likud faction.
"This is a happy day. The sentencing befits the severity of the crime. The public and its elected representatives must now make a reckoning. The court accepted our case that this severely damaged democracy," he said.
The defence slammed the verdict and had argued community service would have been sufficient punishment for the contrite defendant, who has been taken into the bosom of the nation since his father suffered a massive stroke last month.
The court case follows a police investigation into allegations of illegal financing of Ariel Sharon's successful 1999 campaign for the leadership of the Likud which has also entangled the prime minister himself.
In early January, a day before Sharon collapsed, police said they had gathered evidence during a raid on one of his associate's houses which they believed would prove his family received a bribe of $US3 million ($A4.07 million) dollars.
Sources close to the premier claimed the fierce attacks by political opponents following the police claims had contributed to his collapse.
The police inquiry has since been stalled by the prime minister's health crisis, with doubts he will ever regain consciousness.
Omri, who was a key backroom ally of his father, has spent much of the time since his father suffered a brain haemorrhage on January 4 at his bedside at Jerusalem's Hadassah hospital.
Israeli politics has been rocked by a string of corruption
scandals.
Another Likud MP, Naomi Blumenthal, was found guilty on Tuesday of electoral bribery after paying luxury hotel bills for 15 Likud central committee members in return for their vote to secure her a high place on the party's list of parliamentary candidates in the last election.