Matthew Neumann, 67, honorary president of the Washington Sokol, a Czechoslovak physical fitness and cultural organization, died in Singapore April 6 after a heart attack.

Mr. Neumann left Prague, Czechoslovakia, in 1948 following the establishment of a Communist government there. He came to the United States the following year and settled in Washington. He was a roofing contractor here until an injury in 1973 forced his retirement.

Mr. Neumann was active in Czechoslovak organizations in this area and elsewhere in the United States for many years. At the time of his death, he was on a trip to visit such organization elsewhere in the world.

For 20 years he was president of the Washington Sokol Gymnastic and Cultural Organization. In January, he was elected honorary president for life after he declined another term of regular office in order to write a book about Sokol.

Mr. Neumann played a part in persuading the U.S. Post Office to issue a stamp in 1960 to commemorate Jan Masaryk, a Czechoslovak patriot. In 1965, he helped persuade the government to issue a "Sokol Physical Fitness" stamp.

In addition to presiding over the local Sokol, Mr. Neumann was a vice president of the Eastern Sokol District, a member of the board of the Czechoslovak Sokol Abroad, and a member of the board of the Council of Free Czechoslovakia. He also was a member of the Association of Free Czechoslovak Sportsmen, the Czechoslovak American Center in Washington, and the Czechoslovak Society of Arts and Sciences in America.

Survivors include his wife, Tanya, of the home in Washington, a sister, Barbara Gassner, of Chesapeake Beach, Md.