He played in the youth from 1916 for VfL Benrath ( in Dusseldorf -Benrath ). At the end of the twenties, he moved up into the first team. On May 18, 1930, he played with VfL Benrath in the second round of the German football championship against Eintracht Frankfurt. The game, however, was lost with 0:1. In 1935, he reached with VfL Benrath the semifinals of the German football championship, which was lost on June 2, 1935 in Leipzig against VfB Stuttgart 2:3. He came in the final of the German football championship 15 appearances 1930-1935 where he scored nine goals. From 1937 to 1939 he played for FK Pirmasens.
In the German national football team, he was in the period from September 1, 1930 to June 25, 1937 for 26 times and scored 20 active listings. His first goal he scored in his first game on September 1, 1930 against Denmark. He participated with the team at the Football World Cup 1934 in Italy. The team took third place at the World Cup. but in this game Hohmann could not be used because he was injured in the semifinal against Sweden through a collision with the Swedish keeper Anders Rydberg. In this game, he scored twice for Germany. In the 1934 World Cup, he came twice to use. On August 4, 1936, he played for Germany at the Summer Olympics at 9-0 against Luxembourg in which he but did not score. In the quarterfinals, the off against Norway followed.
In June 1949 he became the successor of Raymond Schwab manager of Rot-Weiss Essen. With RWE he was 1953 German Cup on May 1. In the first official DFB Cup final Rot-Weiss Essen defeated, among others, Fritz Herkenrath, Helmut Rahn, Franz Islacker and Bernhard Termath in the Rhine stadium in Dusseldorf Alemannia Aachen 2-1. After the end of the season 1953/1954 he finished his commitment to food and was replaced by Fritz Szepan. From 1955 bs 1958, he coached the club Rheydter game in the 2nd League West. He was also active in the Southwest Association sports teacher. A serious illness ended Hohmann 1962 his work as a trainer. Then he opened the Benrather market a sports shop. On March 31, 1974, he died of heart failure in a hospital Benrather.
According to Karl Hohmann a street in Dusseldorf -Benrath was named. The stadium of VfL Benrath also bears his name.