"is self-Employed allowed in Bangladesh?"

No QBSE version for Asia region

https:// quickbooks.grsm.io/Asia-Pacific

You can still purchase QBSE US version but it only offers a single currency (USD). You may need another workaround to deal with multi currency transactions.

https:// quickbooks.grsm.io/US

https:// quickbooks.grsm.io/us-promo