If you just want to listen to Sinhala songs or comedy audio while driving cars in the game without modifying game files, use the built-in User Track Player.
The biggest hurdle would be . Sinhala distinguishes between intimate ( ඔයා - oyā), polite ( තමුසේ - tamusē), and reverent ( ඔබතුමා - obatumā) forms of address. Tommy Vercetti, a ruthless criminal, would realistically use the most disrespectful forms to enemies, but switch to polite forms when dealing with Colonel Cortez—a nuance entirely lost in the original English script.
While Rockstar Games never officially released a Sinhala version of the game, a dedicated community of local modders created something that became legendary in the Sri Lankan cyber café culture. Here is a look at this fascinating, unauthorized piece of gaming history.
This is the most common interpretation. Community creators (often found on YouTube or Facebook gaming groups) replace the English radio stations or cutscene audio with Sinhala voice acting, often for comedic effect.
Nothing beats hearing a tough character like Ricardo Diaz scream "Ahane! Mama oyaawa maranawa!" (Oh no! I’ll kill you!) instead of English. The mod often incorporates Sri Lankan slang, memes, and political jokes that turn a serious cutscene into a comedy goldmine.