Yes, but I don't know you have to reach there by hiring guide or tour package.

I am afraid that you can not access the lake area. The Heavenly Lake Namtso was closed to tourists due to the continual snowfall in the lake area last December and it is expected to reopen to visitors in April, 2009. Last December, the continual heavy snowfall around Namsto blocked most roads to the scenic area. Most roads were covered with heavy snow and ice, and the temperature dropped dramatically, making it unsuitable for tourists to enter into the scenic area. This April, the weather conditions will become pleasant. There are three largest holy lakes (Namtso Lake, Manasarova Lake, Yamdrok Yumtso Lake).