This chapter offers an in-depth exploration of Thai sentence structure and word order, presenting a comprehensive framework for understanding how meaning is constructed and conveyed in the language. While Thai typically follows a Subject-Verb-Object (SVO) pattern, the chapter emphasizes the flexibility of Thai syntax, highlighting topic-prominent structures and variations such as OSV, VOS, and cleft-like constructions. Foundational components—including the subject, predicate, object, and various types of modifiers—are examined in detail, with attention given to the role of stative verbs, adverbs, and prepositional phrases in sentence formation. The chapter categorizes sentence types into basic, compound, and complex forms, illustrating how clauses can be combined or subordinated to express causality, condition, intention, or contrast. Special emphasis is placed on nominalization, serial verb constructions, and adverbial clauses, along with their syntactic and pragmatic implications. By integrating traditional grammar with contemporary linguistic analysis, this chapter equips learners and educators with essential tools to construct coherent, contextually appropriate, and culturally sensitive Thai sentences.