Official said the city will welcome private investment and initiate public-private-partnership programs.
Sansha will launch a regular flight service in 2016 at an airport on Yongxing Island, where the city government is based.
It also plans to build docks on inhabited islands and reefs.
The city will also push forward the planning and construction of a maritime medical rescue center.
Submarine optical cables will be laid and put into use this year, and WiFi will cover all inhabited islands and reefs.
Sansha currently has 119 registered enterprises and 110 individual businesses that paid taxes totaling more than 700 million yuan, about 106.6 million U.S. dollars in 2015.
Sansha was officially established in 2012 to administer the Xisha, Zhongsha and Nansha island groups and their surrounding waters in the South China Sea.