No, if you were married on Dec 31 2020 then you cannot file single. In your case you can file as Head Of Household if you meet these requirements:
- Paid more than half the cost to run your (or a qualifying parent's) home this year (rent, mortgage, utilities, etc.) and
- Supported a qualifying person.
From your explanation it sounds like you might qualify to file as head of household if your children lived with you.
For additional information:
If you don't meet the requirements you will have to file married filing separately if you do not choose to treat your spouse a resident for tax purposes and file married filing jointly.
[Edited 2/1/2021| 7:45am PST]
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