Use security features of the Qlik Sense and give permission or rights to view the corresponding users country data by applying the security rules on the user id. But first add users list by any excel file or AD connectors to get Users list in to the qliksense and then give rules right to the user if you can check there are many features for security if you have data like
Regions, Country, City, Area, Department
All the suggestions above provide helpful information. You will want to check out these videos that may also help guide you:
The Management Console Series has a series of videos that cover various security topics - and a new blog just released also has a video on exception management and security rules.
You should be able to use custom properties, security rules and section access to achieve the desired results. Let us know how you do.
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If you're trying to restrict users to viewing data in a single app, then section access is the only option. If you are comfortable modifying the load script to create two separate apps, then you can use security rules to grant access based on the country of origin so long as there are AD groups which contain that information.
Data access at app Sheet level : Section Access
Data Access at App level : Custom Properties/ Security Rules.
Watch this Youtube Video for reference.