Some of the colleges in Kerala from where you can pursue B.Sc Psychology (honours) are as follows:

Rajagiri College of Social Sciences, Cochin
St Teresa's College (Autonomous), Ernakulam
Farook College, Kozhikode
Fatima Mata National College, Kollam
Christ College Irinjalakuda, Thrissur

Hope I have answered your question. All the best!