He had to learn to walk and talk again but his love of the sport and desire to represent his country drove him to get back on his bike as soon as he could.
"I was determined to prove the doctors wrong and get my life back on track," he said.
Sharp went on to complete Ironman New Zealand twice, the Nice Ironman in France plus the Port of Tauranga Half Ironman.
In 2014, while preparing for the Nice Ironman, someone suggested he should compete at the Rio 2016 Paralympic Games and he has never looked back.
Sharp went on to qualify as part of a five-strong New Zealand team at the UCI Para-cycling Road World Championships in Nottwil, Switzerland.
Selected at short notice for Rio, he finished a credible but "disappointing" eighth in the Men's Time Trial C3 and just outside the top 10 in the Men's Road Race C3.
Sharp's list of achievements on the national and international stage also includes several first places and top 10 placings.
In 2017, with support from the Tauranga community, he competed in Europe in three UCI Para World Cups, scoring bronze in Italy and silver in Belgium in the individual time trials.
Last year he suffered a bout of major depression and stopped cycling for a while.
But Sharp has reset his sights on Tokyo and needs to achieve top-four finishes at World Cup events in Italy and Belgium in May to qualify for Paralympics New Zealand funding.
That would enable him to compete at the UCI Para-cycling Road World Championships in the Netherlands in September, the next stage in his dream of Paralympic success.
Sharp said the Tauranga community had been "tremendously supportive" of his dream and he was grateful.
"Winning the ultimate prize is every athlete's dream and this means the world to me."
- Donations can be made to Sharp's Givealittle page.