A former Newman-government staffer who impersonated the chief-of-staff of a federal senator to take the job of a single mother has been sentenced to 100 hours of community service.

Kepa Andrews, 42, doctored an email from then Senator Joanna Lindgren's chief-of-staff in June 2015 to trick his boss at Gold Coast-based company Surfside Buslines.

Andrews offered the woman, who he knew was a single mother with a mortgage, a fake job as the senator's office manager, prompting her to resign that day.

He then successfully applied to replace his boss when she quit.

Andrews, who held various roles within the Liberal National Party between 2008 and 2015, including in Mines Minister Andrew Cripps' office, pleaded guilty in Brisbane Magistrates Court on Friday to impersonating a commonwealth official and falsifying documents.

Defence lawyer Rosemary Gilbert said Andrews lied and continued to lie to cover up the fact he had not been successful in getting the job he wanted.

"He thought his connections with the Liberal party, the work he had done would mean that his employment with Senator Lindgren would be assured," Ms Gilbert said.

"He regrets it very much, this is someone who has worked in positions of trust for many years.

"Him being dealt with by the courts means that sort of employment is not open to him any longer."

The court heard Andrews was genuinely remorseful for his actions and resigned out of shame within a day of getting his boss's job.

"I profusely apologise for the stupidity of my actions and the harm it has caused," Mr Andrews said.

In handing down her sentence, Acting Magistrate Robyn Carmody said Andrews' behaviour was "out of character" given his unblemished record.

"I do not believe he acted out of malice," she said.

"The only explanation seems to me that things snowballed out of control and he created a web of deceit from which there was no escape."

Andrews was given a two-year good behaviour bond and ordered to complete 100 hours of community service.