The church is constructed of rough grey stone with decorative brick friezes beneath the roofline and star-shaped vaulted ceilings, features unusual for a rural Dalarna church of this early date. Only the porch is a later addition. Above the Crusebjörn family burial chapel is a so-called "gubbvalv", a vault decorated with carved male figures, an unusual and memorable detail for visitors to look out for. Scholars have noted a strong resemblance between Torsångs kyrka and the slightly older Trönö gamla kyrka in Hälsingland, suggesting both may have been built by the same itinerant Finnish building team working in the region at the time, though this remains a theory rather than a settled fact.
The font, carved from Gotland sandstone, dates from around the mid-thirteenth century and is the oldest object in the church, predating the current stone building itself. The pulpit was added in 1624, and the altarpiece surrounding the chancel window dates from 1795. During restoration work in 1912, overseen by the noted conservator Sigurd Curman, a new stained-glass window was installed in the chancel, designed by Filip Månsson around a central cross motif surrounded by images of the church, the bell tower, the river and the forest.
The separate, shingle-clad and tar-blackened bell tower is one of the church's most atmospheric features. Its precise age is uncertain: historical sources mention a tower already standing in the sixteenth century, but the structure seen today is generally believed to date from the mid-seventeenth century. Investigations of its timber have found reused medieval material, including wall timber dated to the thirteenth century, possibly from an earlier wooden church or chapel on the site — intriguing evidence that today's stone church may have had a wooden predecessor.
The churchyard is enclosed by a stone wall that, besides marking the boundary, has traditionally helped protect the site from flooding when water levels in the nearby lake Runn rise; flood marks are carved into the wall itself. The church and its bell tower also appear briefly in the opening of Ingmar Bergman's film Nattvardsgästerna (Winter Light), a detail of interest to film enthusiasts visiting the area.