Emergency teams rushed to the vehicle fire at Barry Curtis Park on Chapel Rd in the south-east suburb of Flat Bush about 8.10pm on Saturday.
Police confirmed this morning that a body was found inside the car.
"Cordons will remain in place this morning while the scene is examined," police said in a statement.
"Police are making inquiries to determine what has occurred and are not in a position to comment further at this time."
A blue forensic tent was erected over the car last night and a detailed investigation and scene examination has started.
• Police ask anyone with information to contact them on 105, quoting file number 210306/4193. Information can also be provided anonymously by calling Crimestoppers on 0800 555 111.