The ambulance union says a study shows more than half of all Victorian paramedics plan to quit their jobs because they are unhappy with how much they are paid.
About 600 paramedics took part in the survey which found 55 per cent planned to quit in the next five years.
Fifty-four per cent of those surveyed said they would take a job interstate where they could earn more money.
Paramedics are planning industrial action after pay negotiations with the State Government failed.
They want a 30 per cent pay rise over three years.
The Government has offered 5 per cent a year, with changes to conditions and penalties.
Steve McGhie of the Ambulance Employees Association, says paramedics in other states earn as much as $25,000 more each year.
"We know what the morale is like out there and what our members are telling us," he said.
"Fifty-four per cent of the respondents to the survey indicated that they would be prepared to move interstate and be employed as an ambulance paramedic.
"It's a concerning response."
Mr McGhie is defending the size of the pay claim.
"We think that they deserve to be valued the same as paramedics in other states," he said.
"We believe that they have a higher skill set. They certainly have some of the best clinical outcomes for patients anywhere in the world."
Ambulance Victoria's Tony Walker says he understands the concerns of paramedics but does not believe more than half are planning on quitting.
"I don't accept we'll lose 1500 paramedics. Our attrition at the moment is running at about 4 per cent, which is better than most health services," he said.
"I acknowledge that our staff are working in a difficult environment.
"Ambulance is a tough job. Demand is increasing and they are frustrated. They share their frustration with us."