Abstract: As a major part of sociolinguistics, language planning has become a major research topic for many scholars. As a branch of Applied Linguistics, language planning is not a theoretical field of academic research, but mainly based on solving language problems in society. This paper explains the language diversity in Sri Lanka and the issues related with implementing the proper language planning policy in a socio-linguistic perspective.it further elaborates the planning language in educational settings .i.e. language-in-education planning or acquisition planning.