You can submit your HK visa application to 120/4, Vidya MW, Colombo 7 at 9.30am -11.30am from Monday-Friday. The requirements are as follows:
1. A Passport valid for at least 6 months with 2 blank visa pages left or more.
2. completed visa application form with one recent passport-size color photograph.
3. Copy of the passport face page and the previous HK visa.
4. Sponsor letter from Hong Kong and Local company covering letter.
5. Company bank statement, Copy of BRC (Business Registration Certificate) and Company pay sheet (last 3 month).
6. Travel itinerary.
Visa fee is RS. 3000 for 4 working days service.
In addition, please be noticed that a single entry visa to China is valid for 3 months from issue date. if you need to visit China mainland while you are in HK, you'd better apply for China visa in advance together with the one for HK.