@Irin Sultana, the sign in logs will only show you information about user authentication, it won't show each site accessed by the user.
I'm not a Teams / SharePoint specialist, but I believe yo ucan use Purview to look for the SharePoint audit logs you want.
https://learn.microsoft.com/en-us/purview/audit-log-sharing?tabs=microsoft-purview-portal
Let me know if you have further questions.
Thanks,
Fabio