when people are in watching or playing game, what are they saying at the player in Sinhala?

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Answer

Dear Jin , previous answer is wrong. 
Kreedakaya (In Sinhala: ක්‍රීඩකයා  ) means the player (One Player).
If you want to cheer up a group of players write some cheer words in English so everyone can understand. Sinhala language has also taken many English cheer-up words from English.
You can use the word hooray! (in Sinhala : හුරේ ). But that is a very generic one. 
Hope this helps.

Answer

Thank you for answering me... and  does " Kreedakaya" mean same as "hooray!" or " go! go!" ? I want to write down on a banner for a game...

Answer

Kreedakaya

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