Ask from the Bank. Or Check web site.
What is the income required to apply for a Sampath Credit Card?Based on your income you can apply for the following Sampath Credit Cards:
VISA Infinite – on invitation only
VISA Signature – Minimum Annual Income LKR 3,000,000
VISA Platinum - Minimum Annual Income of LKR1,000,000
Sampath Gold - Minimum Annual Income LKR 600,000
Sampath Classic – Minimum Annual Income LKR 360,000
http://www.sampath.lk/en/credit-cards-faq