You can download these free maps of Sri Lanka in pdf format. Some of these maps are interactive maps and Google maps.
Nov 03, 2016 Navigate, coordinate and communicate with a single app. Download maps and use the application completely offline. Galactio is the most advanced, full featured GPS navigation system for Android. With toll minimisation routing, Galactio makes navigation easier, faster and hassle free – even when offline.
A comprehensive map of Sri Lanka’s road systems, historical and religious sites, forests and Wildlife sanctuaries, harbors and diving sites, a guide to explore the country, find your way around or guide to simply to get lost amidst the splendor and beauty of the country.
http://reliefweb.int/sites/reliefweb.int/files/resources/8149F7590823501EC125779800335DEB-map.pdf
by Department of Census and Statistics
http://www.statistics.gov.lk/misc/Map%20of%20Administrative%20District.pdf
Detailed Road Map of Sri Lanka
Sri Lanka: free maps, free outline maps, free blank maps, free base maps, high resolution GIF, PDF, CDR, AI, SVG, WMF.
http://www.d-maps.com/pays.php?num_pay=108&lang=en
https://d-maps.com/pays.php?num_pay=108&lang=en