The q2a sitemap is not saved on the file system but is generated on the fly when you request it ( http://www.yourq2asite.com/sitemap.xml ).
It's dinamically generated by the xml-sitemap-plugin, that is a q2a standard plugin.
If you want to change for some reason (that I've not understood. Do you want to use 2 sitemap.xml ?) the url at which this plugin "listens" for the request, you should change the behaviour of the plugin.
See this line :
https://github.com/q2a/question2answer/blob/8274a6e876c3682e878febfb02080a2291f7612e/qa-plugin/xml-sitemap/qa-xml-sitemap.php#L146
you could change it for instance
from
return ($request=='sitemap.xml');
to
return ($request=='yournewlocation/sitemap.xml');
so that you can now invoke the plugin at the new url :
http://www.yourq2asite.com/yournewlocation/sitemap.xml
Welcome to the Q&A site for Question2Answer.
If you have a question about Q2A, please ask here, in English.
To report a bug, please create a new issue on Github or ask a question here with the bug tag.
If you just want to try Q2A, please use the demo site.