score:4
Sort of, depending on what you're expecting.
There aren't many (any?) natural hot springs within day trip distance of Sydney. To get to natural hot water supplies, you'll have to travel to above the Artesian Basin (six hours drive one-way) or more further afield.
However spa resorts and day spas have become a big thing in Australia, from the truly luxuriant on down and many of these are within day trip range of Sydney.
So depending upon what your aim is - getting a hot spring experience, visiting an actual hot spring or something else - there may be something to fill the criteria.