A Maserati driver has had his licence suspended after being caught speeding three times in two days in southern New South Wales.

The 36-year-old Campsie man was allegedly clocked driving a grey Maserati at 173 kilometres per hour along the Federal Highway at Collector, south-west of Goulburn, about 3:25pm on Sunday.

When police pulled the car over they found the man's eight-year-old son asleep and unrestrained on the back seat.

A licence check revealed the man had been caught speeding twice in the same car on the previous day.

It is alleged he was clocked travelling 152kph in Mittagong and 125kph near Goulburn.

The man has been fined a total of $3,827 for the three speeding infringements.

His driver's licence has been suspended and he is due to face Goulburn Local Court later this month.