Beginner

Say It in Sinhala,⭐⭐⭐⭐⭐
by J. B. Disanayaka

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This is an essential book for the beginner. Available at most Colombo bookstores. Although it is a pocket guide intended for tourists, It has one of the clearest explanations of Sinhala grammar

Let Us Speak Sinhala Vol 1-3 ⭐⭐
by Shirley Perera.  Volume 1 & 2 are good for beginners. English letters only. Available at most Colombo bookstores

An Introduction to Spoken Sinhala⭐⭐⭐⭐
by Professor W. S. Karunatillaka, Godage International Publishers,
http://www.godage.com/book-details/dictionaries/2953-an-introduction-to-spoken-sinhala.html
High quality textbook. Good for self study by people with experience learning languages.

Beginning Colloquial Sinhala: an Introductory Sihala Curriculum⭐⭐⭐⭐
Student Edition http://sales.lrc.cornell.edu/products/student-edition-beginning-colloquial-sinhala-an-introductory-sinhala-curriculum
Teacher’s Guide http://sales.lrc.cornell.edu/collections/sinhalese/products/teacher-edition-beginning-colloquial-sinhala-an-introductory-sinhala-curriculum
This is an excellent completely modern textbook but is not suitable for self study. Many of the exercises are only suitable for a group.

Intermediate

Student Reader: Beginning Colloquial Sinhala ⭐⭐⭐⭐⭐
http://sales.lrc.cornell.edu/collections/sinhalese/products/student-reader-beginning-colloquial-sinhala
This is a great graduated reader with short articles and matching vocabulary lists.

Readings in Colloquial Sinhala⭐⭐⭐
Sinhala – Readings in Colloquial Sinhala
This is similar to the above book with additional grammar notes.

Advanced

comming soon…