As is true of the United States, international trade is not usually handled by a single governmental entity in other countries. You will need to familiarize yourself with the governmental structure of the jurisdiction in which you are interested and the laws that are issued by the various entities.
To assist you with that task, there are databases: The Foreign Law Guide [NetID may be required]. and the free resources of the Law Library of Congress Guide to Law Online and WorldLII may be especially helpful. See also the Department of Justice's International Law Guide which has a section on Trade, Commerce and Intellectual Property and the Department of Justice's Foreign Law Guide
Don't forget to look at research guides for your particular jurisdiction--some of which can be found on the Law Library of Congress and WorldLII websites and by using the United States Department of Justice's Foreign Law Guide - General Resources and Guides section.
See also, for instance:
Primary Legal Sources:
Major US Federal agency websites:
See this list of U.S. Government Trade Agencies (from the USTR) for other links to agencies and other government resources on international trade.
Reference Materials (selected):
Books & Treatises (selected):