Sonceboz-Sombeval has an area of 14.96 km² (5.78 sq mi).
 Of this area, 5 km² (1.9 sq mi) or 33.3% is used for agricultural purposes, while 8.76 km² (3.38 sq mi) or 58.4% is forested.
Of the rest of the land, 1.12 km² (0.43 sq mi) or 7.5% is settled (buildings or roads), 0.07 km² (17 acres) or 0.5% is either rivers or lakes and 0.04 km² (9.9 acres) or 0.3% is unproductive land.

Of the built up area, housing and buildings made up 2.9% and transportation infrastructure made up 3.7%.
 Out of the forested land, 55.8% of the total land area is heavily forested and 2.6% is covered with orchards or small clusters of trees.
 Of the agricultural land, 7.5% is used for growing crops and 14.4% is pastures and 11.3% is used for alpine pastures.
 All the water in the municipality is flowing water.

The municipality is located in the Saint-Imier valley at the foot of the historic Pierre Pertuis pass.
 It consists of the villages of Sonceboz and Sombeval which have grown together.

On 31 December 2009 District de Courtelary, the municipality's former district, was dissolved.
 On the following day, 1 January 2010, it joined the newly created Arrondissement administratif Jura bernois.
Sonceboz-Sombeval has an area of 14.96 km² (5.78 sq mi).  Of this area, 5 km² (1.9 sq mi) or 33.3% is used for agricultural purposes, while 8.76 km² (3.38 sq mi) or 58.4% is forested. Of the rest of the land, 1.12 km² (0.43 sq mi) or 7.5% is settled (buildings or roads), 0.07 km² (17 acres) or 0.5% is either rivers or lakes and 0.04 km² (9.9 acres) or 0.3% is unproductive land.
Of the built up area, housing and buildings made up 2.9% and transportation infrastructure made up 3.7%.  Out of the forested land, 55.8% of the total land area is heavily forested and 2.6% is covered with orchards or small clusters of trees.  Of the agricultural land, 7.5% is used for growing crops and 14.4% is pastures and 11.3% is used for alpine pastures.  All the water in the municipality is flowing water.
The municipality is located in the Saint-Imier valley at the foot of the historic Pierre Pertuis pass.  It consists of the villages of Sonceboz and Sombeval which have grown together.
On 31 December 2009 District de Courtelary, the municipality's former district, was dissolved.  On the following day, 1 January 2010, it joined the newly created Arrondissement administratif Jura bernois.
Sonceboz-Sombeval