To add new module position in your template, you need to add position in the templateDetails.xml and then in your index.php add that position where you want to show your module.
And after that in module manager select that position you have added for that module and check it.
In templatedetails.xml, locate the <positions></positions> start and end tags, then add inside:
newposition In index.php, locate the place in the template where you wish to put the new position and insert:
<jdoc:include type="modules" name="newposition" />
Then check your joomla back-end and set your module position as a “newposition”.