not able to generate sdo for arria 10 soc for post-synthesis timing simulation

They are few method to close the timing. But have to understand how your design work.

Since you are new on Timing Analyzer, you may have to refer to the module below:

https://www.intel.com/content/www/us/en/programmable/support/training/course/odsw1115.html

Click on the follow on courses for the timing training,

After understanding the courses, you can get better picture what you can do to do timing closure.