Hello and welcome to JustAnswer. I would be happy to help you with your question.
What country or state are you referring to?
Thailand? or somewhere in the U.S.?
In the U.S. you do not need the other spouse to sign, you would simply submit a petition for dissolution of marriage and the spouse would then have 20 days to respond. If the spouse fails to respond within the 20 days a default judgment is entered.
After researching it appears to be the same in Thailand. If you are filing for a contested divorce you do not need the spouse's signature.
Good Luck and please let me know if I can further help you or if you have a more specific question and I would be happy to answer.
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