It might take 15 years, but Sydneysiders could one day enjoy 65 hectares of new, uninterrupted parkland just 20 minutes drive from the CBD.

The proposal would see the 18-hole Eastlake golf course converted into a major new public park, as part of the City of Botany Bay's Vision 2040 Directions Paper; the penultimate step in the 25-year vision for Botany Bay.

The Eastlake Golf Course could be in for a transformation under a long-term vision for Botany Bay. Credit:Brendan Esposito

"The last five years has seen around 3000 new dwellings added to the Botany area, with another 4000 expected in the next 10 years ... people need access to public space," City of Botany Bay Mayor Ben Keneally said.

The announcement comes after a Fairfax Media report on Monday found NSW councils have sold, developed or reclassified more than 20 per cent of public urban open space in the past decade.