Explanation:

- The festival in Sikkim that is also known as Bhoomi Puja or Chandi Puja is Sakewa.

- Sakewa is a significant festival for the Rai community in Sikkim. It involves rites to honor and please the earth and nature spirits.

- Barahimizong is another Sikkimese festival, celebrated by the Manger community, typically showcasing cultural performances and rituals.

- Losar is the Tibetan New Year and is widely celebrated in Sikkim with prayers, dances, and feasts.

- Indra Jatra is a festival celebrated in Nepal, primarily in the Kathmandu Valley. It includes various cultural displays and religious rituals.

Hence, the correct answer is Option 4: Sakewa.