Can I still be eligible for Canadian Experience Class if I have returned to my country?

Yes, you can be eligible for the Canadian Experience Class so long as you meet the requirements under the class. This includes having gained at least 12 months of full-time (or an equal amount of part-time) work experience in Canada

in the 3 years before you’re invited to apply
in a job listed as Training, Education, Experience and Responsibilities category 0, 1, 2 or 3 of the National Occupational Classification

Note: Completing an Express Entry profile is the first step to immigrate to Canada permanently as a skilled worker. Completing an Express Entry profile does not guarantee that you will receive an Invitation to Apply for permanent residence. An Invitation to Apply for permanent residence will be based on your score and rank in the Express Entry pool using the Comprehensive Ranking System.