Your employer may recommend a doctor, but you’re not obliged to use them.
However, further into a claim you may be asked to go for an Independent Medical Examination (IME) by WorkCover Queensland or your employer’s workers' compensation insurer.
Your employer cannot dictate a particular treating practitioner. It is your right to choose the doctor you wish to receive treatment from.
You're also entitled to receive a second opinion. Read more about choosing a doctor for your work injury here.