Hundreds of South Australian police officers campaigning against the State Government's changes to workers compensation have marched to Parliament House.

Under the State Government's Return to Work Act, which began on July 1, payments to injured workers will cease after two years unless their injuries are deemed "catastrophic", which means a 30 per cent whole person impairment.

The SA Police Association (SAPA) has been campaigning for the Government to support a bill by Family First MLC Robert Brokenshire that amends the Police Act to restore benefits for officers seriously injured in the line of duty.

The officers and their supporters arrived at Parliament after marching from Victoria Square holding placards stating "protect our cops" and "don't add insult to injury".

Sorry, this video has expired Police march in Adelaide against workers compensation changes.

SAPA president Mark Carroll told the crowd officers had been abandoned by the Government, to which many protestors shouted "shame" in response.

"We've been told our agitation was faint, well is this loud enough for you Premier?" Mr Carroll shouted from the steps of Parliament.

"Cops who put their lives on the line in the protection of the community and when I say the line, it's the frontline, it's the backline and it's everything in between.

"And on that line we stand for democracy over anarchy, we stand for a civilised society."

Government 'obligated' to provide ongoing compensation

The Opposition said it would support the legislation when it was voted on in the Legislative Council.

Police officers protest against workers compensation changes at Parliament House. ( ABC News: Angelique Donnellan )

"This is the most important wrong that we must right," Mr Brokenshire told the crowd.

"The least that we can do as a community is make sure you are properly protected."

One police officer said he believed the Government had an obligation to provide ongoing compensation to injured frontline staff.

"We expect the community and the government to support our families," he said.

"We agree that our job has got risks and we take those freely but we don't want to go home injured and for your family to suffer because you're trying to do you job properly."

Police Commissioner Grant Stevens has written to the police union saying he supports the need for adequate protection for officers injured while on duty.

But he said limits now imposed on income and medical expense payments appeared to be offset by new entitlements which protected "seriously injured" workers and offered lump sum payments for economic loss.

"Whether of not these measures disadvantage officers generally or in specific cases remains to be seen," he said.

Changes to legislation will be considered

Attorney-General John Rau said he was prepared to see if there were gaps in the legislation which negatively affected Government employees working in dangerous conditions.

He said he was unhappy the police union had chosen a public campaign rather than having "calm and informed" meetings with the Government to resolve concerns.

"As far as I'm concerned [the union] is not the ordinary men and women who serve in the police force, they are an organisation that has chosen to engage in a particular type of campaign," he said.

Mr Rau said if any changes were to be made there would be merit in applying them across the state's emergency services sector.

"I have tremendous compassion for people who are injured in that sort of service, wherever they might be employed, and we interested as a Government in trying to understand what the nature of the gaps, if they exist in this legislation, might be," he said.

"Frankly, I think we have to accept that people in the fire services also undertake extremely risky activities in uncontrolled environments as do, for example, ambulance officers who attend scenes which are often quite uncontrolled, with people fuelled with alcohol or drugs and equally risky."